It should do, iplayer only needs a few Mbps and I doubt your internet connection is anything like 85Mbps so as long as the network is faster than your internet you shouldn't lose anything. OK maybe a bit on package overhead but not that much.
I've got a spare wi-fi router. Any idea how they can be set to work with another wi-fi router? There doesn't seem to be any means of making it a 'slave' of an existing network. Is it as simple as giving it the same SSID and password? If it could be made to work, that would be grand as I could give shared access via the router (DHCP turned off on the secondary one) to my 3View box and my HDR FOX T2, the former of which has, as yet, no wi-fi capability.
set your second router has a station, google on how to do for your router
i've managed it without setting the second router has a station, but they did use different networking addresses, main router default address range 192.160.2.xxx second router default address range 192.168.1.xxx