the engineer told me that if I had the hub upstairrs connected to my desktop then I would lose the phone line downstairs. Is this true.
No, it's complete rubbish, either you or the engineer has got the wrong end of the stick. There are two pieces of equipment, the modem, which is connected to the master phone socket, possibly by means of a data extension cable of up to 30m supplied at the time of the installation, and the Home Hub, which is connected to the modem via an Ethernet cable, which can be pretty much as long as you like. Depending in your internal wiring, it may be possible to move the master socket upstairs, which would simplify the cabling. None of this prevents you having a phone line upstairs and downstairs.
Edited by kasg (Sat 01-Dec-12 12:32:27)