What speed were you getting when you were on BT? Speeds vary on ADSL depending how far you are from the phone exchange. If you log in to the router it should tell you what speed you're connecting at
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According to TalkTalk website router settings can be found at
http://192.168.1.1 with the username and password as admin
http://help2.talktalk.co.uk/broadban...-my-sync-speed