Hey Kev
(i'm also (formerly) from newcastle) lol
yes anyway, you will be, more than likely, provided with a DSL modem, perhaps at a cost, depending on if theyre being stingy.
as for the router, interceptor knows more bout them then me, but as for a UK supplier, I would recommend amazon.co.uk.
I got the required parts for my wireless network from there, although I got it easy with a combined BT WiFi/Modem setup

If your unsure about a product post here first and im sure someone will fill u in on the details