BT's www.speedtester.bt.com is the only official way to get this info.
NB. I've put some notes on the bottom of this page
www.hmmm.ip3.co.uk/speedtest.
If you know how your line normally performs then you are able to quickly see if you are on your normal IP Profile or if it has dropped/rised by seeing your current throughput.
Obviously if you are having a problem then you will need the BT results...
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