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Yes. If you need to add a telephone extension cable in order to connect your computer to your telephone socket, then normal extension cable is perfectly adequate. Since ADSL broadband uses the normal telephone network, a standard, self-install, telephone extension cable is fine.
There is no upper limit to the length of extension you can plug in to your BT telephone socket. The standard sizes, 3m, 5m, 10m, 15m and 30m telephone extension cables available should be fine, and will certainly be sufficient for most users.
Business users who opt for an engineer assisted installation, should have any additional cabling work carried out by the engineer.