Why do you need another phone line? Getting a Voice Over IP (VOIP) service will be a lot cheaper than a second physical line, if you want another phone number and to be able to have 2 calls in progress at the same time.
You don't need to get BT (Retail) to install a new line in any case, almost any phone provider will arrange it (often more cheaply than BT Retail) although it will be BT openreach that do the cabling.
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