Full fibre reaches 61.1% of homes in St Mary's, though only 0% of connections run at 300 Mbps or faster. Typical measured speed is 56 Mbps down and 14 Mbps up, 45% below the UK download average. 14 providers offer 190 broadband deals, up to 1,600 Mbps.
Deals for St Mary's (TR21), checked and refreshed daily.
Best value broadband deal in St Mary's (TR21)
The best value in St Mary's (TR21) on full first-year cost is 4th Utility's 300Mb Full Fibre (24 Months): £240 across year one, about £20 a month. At 300 Mbps it copes with anything a household runs at once.
Best value in St Mary's (TR21)
£20/mo
for 12 months, then £40/mo
Cheapest broadband deal in St Mary's (TR21)
The cheapest deal in St Mary's (TR21) is Fibre 40 from Onestream at £18.50 a month for 40 Mbps. 4th Utility is essentially level at £20.00 a month. Well below the UK average, which shows on a busy evening.
Cheapest in St Mary's (TR21)
£18.50/mo
rises to £21.25 in April 2027 (+£2.75)
Runner-up on price
£20/mo
for 12 months, then £40/mo
Fastest broadband deal in St Mary's (TR21)
The fastest deal available in St Mary's (TR21) is Full Fibre 1.6GB from EE at 1,600 Mbps. Zen Internet matches it at the same top speed.
Fastest in St Mary's (TR21)
£34.99/mo
rises to £38.99 in March 2027 (+£4)
Runner-up on speed
£45/mo
No rises, no surprises.
Compare broadband deals in St Mary's (TR21)
£23.99/mo
rises to £27.99 in March 2027 (+£4)
£24/mo
No rises, no surprises.
£24/mo
No rises, no surprises.
£23.99/mo
rises to £27.99 in March 2027 (+£4)
Broadband providers in St Mary's (TR21)
14 providers serve St Mary's (TR21) including Sky, BT and Vodafone, with EE the fastest at 1,600 Mbps.
Ranked by Ofcom complaints per 100,000 customers, fewest first. A down arrow is below the industry average, up is above, and a dash means Ofcom publishes no figure for that provider (usually because it is below Ofcom's 1.5% market-share reporting threshold). A small diagonal arrow shows the past-year trend (↘ improving, ↗ getting worse).
Ofcom records the typical St Mary's (TR21) download speed at 56 Mbps.
Upgrade nudge
Room to upgrade in St Mary's (TR21)
Only 0% are on 300Mbps or faster, even though 61% can get gigabit.
The faster line is already there. For most of these homes it is the contract holding them back, not the infrastructure.
Is your broadband good enough?
The typical St Mary's (TR21) line runs 56 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 61% of St Mary's (TR21), and the fastest available is 1,000 Mbps. The full split by band is below.
What broadband coverage does St Mary's (TR21) have?
Superfast broadband reaches 96% of St Mary's (TR21) premises but gigabit only 61%, so around 35% of homes can get fast broadband but not the fastest.
How St Mary's (TR21) compares within Isles of Scilly
Across 5 postcode districts in Isles of Scilly, by connection count, typical speed and gigabit coverage.
Nearby areas
Frequently asked questions
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Speed and coverage figures for St Mary's (TR21)come from Ofcom's Connected Nations data, current to January 2026. Deal prices are pulled live from providers. Compiled by the FindBroadband team. See how we rank and source our data.