SL3 postcode area guide — Buckinghamshire

Where is SL3?

Broadband & internet speeds in SL3

Excellent coverage

Broadband availability in the SL3 postcode district (Buckinghamshire) is Excellent — gigabit-capable full fibre is widely available. Across the 1,046 postcodes Ofcom measures in SL3, superfast broadband (30 Mbit/s or faster) reaches 94.8% of premises and gigabit-capable lines are available to 81.3%.

Around 0.5% of premises in SL3 fall below the Universal Service Obligation (a minimum of 10 Mbit/s download and 1 Mbit/s upload), so the overwhelming majority of homes and businesses here can already order a decent fixed line. For a business that depends on its connection, the figures that matter most are gigabit and full-fibre availability — the symmetric, low-contention services we quote leased lines and FTTP against.

Sample postcodes in SL3

Run a speed test to see what you're actually getting, or check your exact postcode.

Mobile signal around Buckinghamshire

Ofcom's coverage model for the wider Buckinghamshire district (250,700 premises):

Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.

Crime in SL3

Police recorded 226 incidents within about a mile of the centre of SL3 in May 2026 (latest published street-level data). The breakdown:

Raw counts favour busy town centres — a high street with shops and nightlife records more incidents than a residential cul-de-sac. Source: police.uk open data (point sample around the district centroid).

House prices in SL3

Based on 311 sales registered with HM Land Registry in the last 12 months, the median sold price in SL3 is £435,000, essentially flat on the previous year (£437,000).

Latest recorded sales in SL3

Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.

Who lives here? Buckinghamshire demographics

Census 2021 figures for the wider Buckinghamshire district (553,079 residents, 220,327 households):

Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.

Schools in and around SL3

Source: DfE Get Information about Schools (England & Wales). Check Ofsted report cards for inspection detail — headline one-word grades were retired in 2024.

Food hygiene ratings in SL3

221 rated food businesses operate in SL3. 123 hold the top rating of 5, 44 are rated 4, and 9 are rated 2 or below.

Among the 5-rated: OCS Food Co @ DHL Southern Hub, 360 VISION FITNESS WELLNESS NUTRITION CIC, Accent Catering at Langley Hall Primary Academy, Accent Catering Services Ltd, Adventure Learning Day Nursery.

Source: Food Standards Agency, food hygiene ratings (FHRS) open data.

Energy performance (EPC) in SL3

From a sample of 235 Energy Performance Certificates across 11 SL3 postcodes, the most common rating is band D (average band D). 29% of sampled homes are rated C or better.

Source: MHCLG Energy Performance of Buildings Data (England & Wales), sampled at postcode level and refreshed monthly. Individual certificates are on each postcode’s page.

Phone area codes for Buckinghamshire

Landlines around SL3 typically use:

Had a call from an unknown number? Use our free UK phone number checker to see who called.

What's it like living in SL3?

Postcodes in SL3

Neighbouring districts

All Slough (SL) postcode districts ›

Frequently asked questions

Sources: HM Land Registry Price Paid Data, police.uk street-level crime, Ofcom Connected Nations, ONS Census 2021, DfE Get Information about Schools, Food Standards Agency FHRS — all © Crown copyright, licensed under the Open Government Licence v3.0. Figures are area aggregates; individual addresses vary. Energy performance (EPC) data will be added when our Open Data Communities registration is approved.