Last updated: Tuesday 15 September 2026 (Europe/London).
Next update: when communityfibre.co.uk reprints flash end dates, mid-contract £ rises, or London coverage maps.
By: Switch Editorial Team, Switch Squid Ltd
As of 15 September 2026, Community Fibre’s own London shop prints a 10% new-customer flash sale ending 16.09.2026 — Full Fibre from £11.25 a month on 35 Mbps (£135 over 12 months of that flash monthly) and 1 Gbps from £22.50 a month (£270 Year-1 monthly cash), with no set-up fee and a router included on the cheap-broadband-deals cards I fetched from communityfibre.co.uk. Mid-contract wording on the same shop still points to a £3 per month rise every April from April 2027, and £4 more at the end of the contract versus the last in-contract month.
I am Switch. I rank Community Fibre London deals from the retailer’s own shop, not from comparison exclusives. Availability is London / network footprint — always run the postcode checker before you celebrate a headline. Compare wider broadband cards on the broadband hub.
Compare London broadband deals on SwitchSquid →
What Community Fibre actually is
Community Fibre is a full-fibre altnet concentrated on London and the South East — not Openreach FTTP in a BT-style wrapper, and not Virgin Media coax. Shop copy leans hard on symmetric-ish full fibre, no line rental as a separate copper tax, and free installation on the cards fetched today. That is why London postcodes show up in this keyword and Manchester ones usually do not.
Flash ranking table — own shop 15 September 2026
| Plan (display_name) | Flash £/mo | Was £ | Year-1 monthly cash | Notes |
|---|---|---|---|---|
| 35 Mbps Full Fibre | £11.25 | £12.50 | £135.00 | Flash 10% ends 16.09.2026 |
| 75 Mbps Full Fibre | £13.50 | £15 | £162.00 | same sale window |
| 150 Mbps Full Fibre | £17.10 | £19 | £205.20 | lower flash tier |
| 500 Mbps Full Fibre | £18.90 | £21 | £226.80 | lower flash tier |
| 1 Gbps Full Fibre | £22.50 | £25 | £270.00 | headline gig tier on sale |
| 150 Mbps (alt tier) | £22.50 | £25 | £270.00 | higher flash card |
| 500 Mbps (alt tier) | £25.20 | £28 | £302.40 | higher flash card |
| 1 Gbps (alt tier) | £27 | £30 | £324.00 | higher flash card |
| 1 Gbps Premium WiFi | £28.80 | £32 | £345.60 | mesh/premium add |
| 2.5 Gbps | £35.10 | £39 | £421.20 | multi-gig |
| 5 Gbps Premium WiFi | £56.70 | £63 | £680.40 | top shop card |
Source: communityfibre.co.uk/cheap-broadband-deals HTML/JSON cards fetched 15 September 2026 — price / old_price pairs with “Flash sale - 10% off” and offer end 16.09.2026. Year-1 monthly cash = flash monthly × 12 (does not net the later April £3 steps or the end-of-contract £4). Separate FDM comparison block on the same domain still shows CF ~350 Mbps at £21.00 and ~920 Mbps at £25.00 on 24-month comparison rows — useful context, but the flash cards are the live sale lead.
Flash end date — diary 16 September 2026
The 10% new-customer flash is time-boxed. If you are reading this after 16.09.2026, re-open communityfibre.co.uk — do not trust this table’s flash pounds. ISPreview’s 18 August 2026 write-up matches the same end date and the return of mid-contract £3 April rises after a brief no-hike window earlier in summer. Shop legal copy on the page I fetched still states prices for new customers only, £4 more when out of contract, and £3 annually in April thereafter.
No-rise vs £3 April — read the checkout
Community Fibre briefly marketed no mid-contract hike earlier in 2026; the current flash path reintroduces pounds-and-pence April steps. That is not RPI mystery maths — it is a stated £3. Still model Year-2 and Year-3 if you take 24 months. A “cheap” 1 Gbps at £22.50 flash is not the same bill in April 2028.
London availability — postcode or it did not happen
Altnet coverage is patchy even inside the M25. Community Fibre’s in-my-area / checker flow is the only honest availability source. A deal that looks brilliant in Hackney may 404 in a street two postcodes over. If the checker says no, look at Hyperoptic, G.Network or Openreach full fibre on the SwitchSquid broadband hub — do not invent a CF install.
How CF stacks against nearby published comparisons
Community Fibre’s own comparison tables (FDM-verified copy dated early September 2026 on the shop) put CF 300-class and 1 Gig rows against BT, Sky, Virgin, EE, TalkTalk, Plusnet and Hyperoptic samples from selected London postcodes. Those competitor monthly figures are Community Fibre’s published comparison set — useful for narrative, not a substitute for opening each rival’s own basket. On cash alone, CF’s flash 1 Gbps at £22.50 is aggressive versus many national gig cards in that same comparison block. Coverage and customer-service appetite still matter more than a £3 gap.
Which speed should a London flat actually buy?
- 35–75 Mbps — single person, light streaming, mostly phones. £11.25–£13.50 flash is the cash story.
- 150–500 Mbps — WFH video + 4K + kids’ tablets. £17.10–£25.20 flash range.
- 1 Gbps — busy household, uploads, cloud backups. £22.50 flash lead on the lower gig card.
- 2.5–5 Gbps — niche; only if you have a use for multi-gig LAN and the building can terminate it cleanly.
Symmetric marketing is nice; Wi-Fi is still the bottleneck in most Victorian conversions. Premium WiFi cards cost more monthly — only buy mesh if the flat’s walls already defeated the standard router.
Switching tips for London renters
- Run the Community Fibre postcode checker before you give notice elsewhere.
- Photograph the existing master socket / fibre terminate point.
- Ask the building manager about wayleave if you are in a block — altnets sometimes need it.
- Diary the flash end date and the first April rise.
- Keep the old ISP live until the new line is tested at evening peak.
When you want national Openreach or Virgin paths as well, use the broadband hub rather than forcing every London postcode into a Community Fibre-only story.
Contract length, satisfaction windows and exit reality
Community Fibre’s flash cards sit on fixed terms — commonly 12 or 24 months depending on the SKU behind the display name. The HTML I fetched today does not always print the term in the same JSON field as the flash price, so treat checkout as gospel. A 24-month 1 Gbps at £22.50 flash looks cheaper per month than a 12-month twin at £27, but you are signing longer exposure to the April £3 steps and the end-of-contract £4 bump. If you rent and might move in month 14, model early-termination maths before you chase the lower monthly.
Shop marketing elsewhere on the Community Fibre site has referenced a satisfaction-style leave window in past campaigns (for example leave within 60 days if issues cannot be fixed). That is a customer-service promise, not a substitute for reading the order summary. Screenshot the flash end date, the monthly pound, the April rise line and the out-of-contract +£4 line before you click pay.
Upload speeds, Wi-Fi and the “full fibre” label
Full fibre to the home is the product class — light, not magic. In a London converted warehouse with foil-backed insulation, a 1 Gbps terminate point can still deliver 80 Mbps to the back bedroom on Wi-Fi 5. Walk the flat with a speed-test app on the day of install. If the master socket lands in a hallway cupboard, budget for a wired backhaul mesh or a Premium WiFi card only after that test fails. Do not buy 2.5 Gbps to compensate for brick walls.
Upload matters for creators and VPN-heavy WFH. Community Fibre’s symmetric marketing is part of the altnet pitch versus classic Openreach packages that still advertise uneven up/down. Verify the upload figure on the exact SKU at checkout — marketing pages blur tiers.
How I would choose tomorrow morning in Zone 2
If the checker says yes and the household is two people who stream: start at 150 Mbps flash (£17.10) unless you already know you need gig uploads. If you are four people on simultaneous 4K and cloud backups: 1 Gbps flash at £22.50 is the cash/lead speed sweet spot on today’s lower gig card. If you are a single renter who mostly uses phones: 35 Mbps at £11.25 is the honest cash lead — ignore multi-gig envy. Then diary 16 September 2026 so you do not miss the flash cliff, and diary the first April rise so the bill does not “surprise” you.
Finally, keep one tab open on the SwitchSquid broadband hub for Openreach and cable alternatives in the same postcode. Community Fibre wins many London cash races right now; it does not win every building.
FAQ
What is the cheapest Community Fibre London deal on 15 September 2026?
On the own-shop flash cards I fetched, 35 Mbps Full Fibre at £11.25 a month (was £12.50) — £135 over 12 months of that monthly — with the 10% sale ending 16.09.2026.
How much is Community Fibre 1 Gbps on the flash sale?
The lower 1 Gbps Full Fibre card prints £22.50 (was £25), which is £270 Year-1 monthly cash before April rise steps. An alt 1 Gbps card prints £27 (was £30).
When does the 10% flash end?
Own-shop copy: 16.09.2026. Re-check communityfibre.co.uk after that date.
Does Community Fibre raise prices mid-contract?
Current shop wording: £3 per month every April from April 2027 on the flash path, and £4 more at the end of the contract versus the last month.
Is Community Fibre available outside London?
Footprint is London / South East focused. Only the postcode checker decides — do not assume a deal from this page installs nationally.
Are there set-up fees?
Flash cards fetched today show £0 set-up and router included. Confirm at checkout.
Should I pick Premium WiFi?
Only if the standard router failed a real-world walk-round of your flat. Premium cards add monthly cash (for example 1 Gbps Premium WiFi flash £28.80).
How does this compare with Plusnet or Hyperoptic?
Use each retailer’s own shop on the day you buy. CF’s comparison table is a starting point; SwitchSquid’s broadband hub aggregates live cards without inventing exclusives.
I am Switch. London fibre moves fast — re-open the shop before you sign.
