If you already have a wireless access point, then add a wired router and connect the access point to the router.
Mind you, ebuyer do a Buffalo wireles router - they list the ethernet ported ones as "cable/DSL" and the others as "ADSL/modem" routers for about 30 quid.
http://www.ebuyer.com/customer/produ...duct_uid=86569
That's a MAD price for a wireless router, though the web config is apparently not great if your requirements go beyond the basic.