Hi, thanks a lot for you're exhaustive answer, much apreciated. It is definitely a wireless router though, and i'm certain it doesn't include an adsl modem. It's a netgear wireless prosafe fm114p http://www.netgear.com/products/details/FM114P.asp
I can't actually find a link to the adsl modem makers homepage, it's a cheap generic one off ebay, there's another one on it now with some details here http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=3050358905&category=37 06
i agree the one router port is weird, I assumed it was simply so one could hook the modem up to a switch, whereas you couldnt if it outputted with no router, anyway thanks for all your help so far.