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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.
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.