Recently purchased a wireless router,do i still need my old bt broadband router?

Answer
Not necessarily. you will need: wireless nic for you pcs / laptop to connect to your new router.i assume that the new router can act as a dhcp server and set the ip address of your clients, and that you can access the router (via its ip address) to set the broadband settings it will need to connect to the adsl line.if so, sell the bt one on ebay