As philippercival says, except I would first try turning off the router for ten minutes, then on again, and do the BT speed test to check the IP profile a few minutes later. (The throughput may not rise immediately even if the IP Profile does, assuming Enta still use an internal copy of it. That copy can take a few hours to update, but the BT version these days on ADSL2+ is instant).
The first and last of your two links are the ones to give them if the profile stays stuck at 2Mbps.
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