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What's your postcode?
Or rather - go to somewhere like Ofcom broadband checker and it should tell you, based on other tests, what people in your postcode have been getting. Should let you know if you've got a bit of headroom.
https://checker.ofcom.org.uk/broadband-coverage
I think also that BT will only offer the service if they're capable of delivering it (or at least think they are). And PlusNet just run over the same cables
https://www.bt.com/broadband/availability/
duncs-
go to somewhere like Ofcom broadband checker
This works well but keep in mind that it provides an averaged figure and should you live in a block of flats with old/crumbling cabling you can expect to get a lot less than the figure shown here.
The Ofcom web site says 50Mb should be possible for us but given our circumstances we know that we can only get about 25 to 30Mb. This is why the Att and SNR figures can be useful as it gives an estimate for your actual circumstances.
Stonehedge
Knowledgeable ADSL people. We're with Plusnet on a 40/10 line. I'm told we're not close to our exchange, but we get decent service. 36-38 Mbps according to Speed test.net, usually depending on time of day.
Upgrading to an 80/20 line is a pretty marginal cost. But I've been warned off in case the line from the exchange to our flat can't support the upgrade. The connection speed listed on our modem/router (sync speed?) is 39.95 Mbps. What's people's experience? If I pay a bit more, will I see double speed? Or will I just get the same for more money?
Plusnet's minimum guarantee is fair on our current service (and we've had to take advantage of it), but pretty low on the more expensive service.