Adsl goes to 8 Mbps Adsl2 to 16 and Adsl2+ to 24 Mbps, your download speed depends on the distance you are from the Bt exchange and the quality of your copper line. This has remained the same now you have changed provider they just have you on their kit in the exchange instead of Bt's.
Ask Talk Talk to run a copper line test on your line, tell you how long your line is, and make sure you are on 2 plus as I said earlier then post it here tomorrow.
Also make sure they tell you if your line is showing any faults.'oh and finally ask what profile you are set to and your Snr margins.
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