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Just for people's information, you can get a rough idea of what speeds your line can support here:
BT Broadband (btwholesale.com) but just bear in mind that this is not 100% accurate and can mislead you into thinking your line can support faster speed than it actually can.
My figures are:
However, in practice I only get (with the standard TalkTalk router) approximately 35Mbps download and 5Mbps upload.