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Can you find figures for line attenuation and signal to noise ratio in your router for your current connection?
If you can find those figures you can calculate your likely speeds on the faster connection type.
Distance from exchange is less of an issue now days. Distance to your green street cabinet is the most important factor.
Edit: ^ because exchange to cabinet tends to be super fast fiber that doesn't degrade with distance but cabinet to your house is slow copper which degrades quickly over distance.
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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/ -
If you are getting 39.95 you will probably get more on an 80/20 service. Perhaps not double though.
If you have 40/10 you have a VDSL FTTC service. The data bit is fed from a DSLAM in a cabinet near to your PCP (primary connection point, BT green cabinet). Distance to the exchange doesn't matter, distance to the cabinet does.
The checker at https://www.broadbandchecker.btwholesale.com/#/ADSL will predict a speed.
If you are bored it will also tell you what cabinet you are connected to (eg P32) You can then tour the local area and find the one with that number on the side. In the example below the number with 32 on is a PCP extension, the middle bit is the PCP and the bit on the far side is an FTTC/G.fast cab. Further down the road is a grey Virgin Media fibre junction cabinet and then further down still is the FTTC/VDSL cabinet.
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Stonehedge
duncs
jellybaby
@Psy
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.