There's a UK postcode lookup that takes 30 seconds and routinely changes the broadband bill of any household that runs it. Type your postcode into thinkbroadband.com or ispreview.co.uk and the site lists every fibre network actually deployed at your address. For roughly 70% of UK premises in 2026, the answer now includes at least one full-fibre alt-net (Hyperoptic, Community Fibre, CityFibre, Toob, Brsk, Lit Fibre, Trooli, or one of a dozen others) alongside the standard Openreach option.
The alt-nets exist because the UK has finally had a competitive fibre rollout, and they're priced like new entrants — substantially below the mainstream ISPs for equivalent or faster speeds. Hyperoptic at £30/month for 1 Gbps is genuinely cheaper than BT at £45/month for 150 Mbps via Openreach. The maths only resolves once you know which providers physically reach your specific building, which is what the postcode lookup tells you.
The substantial majority of UK households are still on contracts with one of the big four ISPs that haven't been competitive on price since 2022 or so. The reason isn't customer satisfaction; it's inertia. Switching takes about 20 minutes and typically saves £100-£300/year.
What full-fibre actually changes
For most of the 2010s, "fibre broadband" in the UK meant fibre to the cabinet at the end of the street, then copper for the last few hundred metres into the house. Speeds were capped by the copper, not the fibre, at 30-80 Mbps, and reliability dropped sharply for anyone living far from the cabinet.
Full-fibre (FTTP — fibre to the premises) replaces the copper with fibre all the way into the home. The technical consequences:
Speeds scale to 1-2 Gbps reliably. The 100 Mbps you actually get on full-fibre is the 100 Mbps the marketing claimed; it doesn't drop because of distance from a cabinet.
Latency is lower and more consistent. For Zoom, gaming, and remote work, the experience is more responsive even at the same headline speed.
Reliability is dramatically higher. Copper telephone lines fail or degrade in rain, frost, and after maintenance work. Fibre doesn't.
Speeds upload symmetrically with download in many cases. The ancient asymmetry where you could download fast but upload slowly (which mattered for video calls, large file uploads, and home backups) goes away on most full-fibre packages.
For the substantial majority of UK households still on copper Openreach (FTTC), upgrading to full-fibre at any speed is a meaningful improvement to the daily experience, often at lower monthly cost than the existing copper contract.
The three categories of UK broadband
The UK market in 2026 splits into three structural categories, and the right pick depends on what's available at your address.
Openreach-based ISPs. BT, Sky, TalkTalk, EE, Plusnet, NOW Broadband. All of them sell broadband over the Openreach network — the same physical infrastructure, with the ISP differences being price, customer service, contract terms, and bundled services. Openreach has been steadily upgrading its network from copper FTTC to full-fibre FTTP; full-fibre availability via Openreach is now around 60-65% of UK premises and rising fast.
Cable (Virgin Media O2). A separate physical network in roughly half of UK premises, with its own cable infrastructure. Speeds historically led the market (Gig1 at 1.1 Gbps); the network has been competitive on raw speed, less competitive on price-per-meg.
Alt-nets (full-fibre). Independent fibre networks that have been laying their own infrastructure since around 2018, often street-by-street in specific cities. Hyperoptic is the urban / multi-dwelling specialist (most flats and apartment blocks in major cities now have it); Community Fibre and G.Network dominate London; CityFibre runs the largest UK-wide alt-net (resold by Vodafone, Zen, TalkTalk, and others); regional names like Toob, Brsk, Lit Fibre, Trooli cover specific cities.
The three categories overlap in roughly half of UK postcodes. Where they overlap, the alt-net is usually the cheapest for the speed; where only Openreach is available, the choice is between the big mainstream ISPs.
What to do, in order
The 30-minute exercise that beats almost any other broadband decision:
Step 1: Look up your postcode at thinkbroadband.com. The site lists every fibre network deployed at the address. Most postcodes will show Openreach plus one or two alt-nets. A few will show three or four.
Step 2: Look up the alt-nets directly. Hyperoptic, Community Fibre, and CityFibre all have address-checkers on their websites that confirm whether they actually serve your building. CityFibre is wholesale-only, so you'd buy via Vodafone, Zen, or TalkTalk on CityFibre infrastructure.
Step 3: Get current Openreach FTTP availability. BT's checker at bt.com or Sky's checker tells you whether full-fibre is available via Openreach at your address. If it is, BT, Sky, EE, or TalkTalk full-fibre is a competitive option.
Step 4: Compare actual prices. Indicative April 2026:
| Service | Speed | Monthly cost |
|---|---|---|
| TalkTalk Fibre 35 (FTTC) | 35 Mbps | £20-£25 |
| BT Fibre 1 (FTTC) | 50 Mbps | £25-£30 |
| Virgin Media M125 | 132 Mbps | £25-£35 |
| BT Full Fibre 100 (FTTP) | 150 Mbps | £30-£40 |
| Hyperoptic 150 (FTTP) | 150 Mbps | £25-£32 |
| Community Fibre 150 (FTTP) | 150 Mbps | £20-£28 |
| Virgin Gig1 | 1 Gbps | £45-£55 |
| Hyperoptic 1Gb | 1 Gbps | £35-£45 |
| Community Fibre 1Gb | 1 Gbps | £30-£40 |
Where alt-nets are available, they're typically £5-£15/month cheaper than Openreach ISPs for equivalent speeds.
Step 5: Check current contract end date. Switching mid-contract incurs early termination fees that often wipe out the saving. Wait until renewal, or if the new ISP is offering enough credit to absorb the early termination, calculate the breakeven.
Step 6: Switch via the new ISP. The Switching Code (Ofcom rule) means the new ISP handles the cancellation of the old service. You don't need to phone the old provider. The transition typically takes 7-14 days.
The 30 minutes saves £100-£300/year for most households on long-tenured contracts.
How much speed actually matters
A pattern that costs UK households substantial money: paying for 1 Gbps when the household uses about 80 Mbps in practice.
Honest assessment of speed needs:
1-2 person household, casual use (streaming, browsing, occasional video calls): 50-100 Mbps is comfortable. The lower end of full-fibre at £25-£30/month covers this completely.
3-4 person household with WFH and 4K streaming: 100-300 Mbps is the right tier. Multiple simultaneous video calls plus 4K streaming on multiple devices works well; the bottleneck is rarely the connection.
Heavy gaming, large file transfers, multiple WFH adults, smart home with many devices: 300-500 Mbps is generally enough. The increase to 1 Gbps is mostly imperceptible in daily use.
Genuine 1 Gbps need: only for specific use cases — video editors uploading large files, software developers pulling large repositories, cloud-storage power users, content creators with substantial upload patterns.
For most UK households, 100-300 Mbps full-fibre is dramatically more than enough. The 1 Gbps tier is mostly an upsell that produces a faster speed test number rather than a faster daily experience.
The Wi-Fi vs broadband distinction
A common confusion: "my broadband is slow" sometimes turns out to mean "my Wi-Fi is slow", which is a different problem.
The connection from the ISP into the house is the broadband. The Wi-Fi is what carries the signal from the router to your devices. The two can underperform separately.
In a 3-4 bedroom UK house, the ISP-supplied router often produces strong Wi-Fi in the room it sits in and patchy Wi-Fi at the far end of the house. Upgrading the broadband doesn't help; upgrading to a mesh Wi-Fi system (TP-Link Deco, Eero, Google Nest Wifi Pro) does.
The right diagnostic: run a speed test on a wired connection (Ethernet cable plugged into the router) versus the Wi-Fi connection in the same room versus the Wi-Fi connection in the worst room. If the wired test is fast and the Wi-Fi tests are slow, the problem is Wi-Fi coverage, not broadband. £150-£300 of mesh Wi-Fi solves it.
If the wired test is slow, the problem is broadband; that's where switching ISPs makes a difference.
The alt-net specifics, briefly
The major alt-nets and where they're strong:
Hyperoptic — urban specialist, mostly serves apartment blocks and multi-dwelling buildings in major cities (London, Manchester, Birmingham, Leeds, Bristol, others). If you live in a flat in a city, Hyperoptic is often available even when alt-net competitors aren't. Pricing typically £20-£45/month for 150-1000 Mbps speeds, on rolling or fixed-term contracts.
Community Fibre — London focus, residential-led, competitive pricing. Often the cheapest gigabit option in London at £30-£35/month.
G.Network — London business and residential, smaller footprint than Community Fibre.
CityFibre — UK's largest alt-net, infrastructure-only. You buy via Vodafone, Zen Internet, TalkTalk, or several other CityFibre-using ISPs. Strong coverage in non-London cities.
Toob — Southampton, Portsmouth, Bournemouth area specialist. Aggressive pricing in served areas.
Brsk, Lit Fibre, Trooli, Glide, Lightning Fibre, etc. — regional alt-nets with specific city focus. Varies wildly; check the postcode.
The alt-nets are also frequently cheaper after the introductory period than the mainstream ISPs. Mainstream ISPs apply CPI + 3.9% (or higher) annual price rises mid-contract; some alt-nets are explicit about not raising prices mid-contract, which compounds the savings across a 24-month deal.
Mobile and 5G home broadband
A genuinely viable alternative for some households: 5G home broadband from EE, Three, Vodafone. £25-£45/month for 100-300 Mbps depending on location and signal.
The case for it:
Areas where Openreach FTTP isn't yet available and Openreach FTTC is slow. 5G home broadband often beats the available fixed-line option.
Households wanting flexibility — 5G plans are typically rolling 30-day, no engineer visit, plug-and-play. Right for renters or anyone with uncertain duration in the property.
The case against:
Speeds vary with cell tower load, weather, and signal strength. The 200 Mbps marketing figure can be 50 Mbps in practice during evening peak hours.
Latency is generally higher than fixed-line full-fibre, which matters for gaming and video calls.
Data caps exist on some 5G plans; verify before assuming unlimited.
For households with full-fibre available: stick with full-fibre. For households without and on slow Openreach copper: 5G home broadband is worth checking.
What I'd actually do
For most UK households: postcode-check at thinkbroadband.com, identify the available providers, pick the alt-net if available at the speed you actually need (100-300 Mbps for most households), or BT/Sky/Vodafone full-fibre via Openreach if alt-net isn't there. Avoid 1 Gbps unless you have a specific use case for it; the 100-300 Mbps tier is dramatically better value.
For renters or short-term residents: rolling-contract options (Hyperoptic 30-day, NOW Broadband, 5G home broadband from EE) avoid early termination fees if you move.
For UK households on long-tenured contracts paying £40+/month for FTTC: switching to full-fibre, where available, will be both faster and cheaper. The switch is the most valuable broadband decision most UK households can make in 2026.
For mainstream ISP loyalty: accept that the loyalty isn't being repaid. The mainstream ISPs price for new customers, not existing ones. Switch at every renewal until the price discipline returns.
The UK broadband market has finally caught up with the rest of Europe in 2026. Most of the work for households is finding out what's actually available; once you know that, the savings come from picking the best option for your address rather than defaulting to the brand you recognise.
This article is general consumer information about UK broadband. Verify ISP availability at your postcode; UK ISPs are regulated by Ofcom for consumer protection.
Affiliate disclosure: Morningfold has affiliate partnerships with several UK ISPs via comparison sites. See editorial standards.