Originally Posted by Matth

Not sure they actually "support" the wireless anyway.

It seems the Virgin cable router is a WGR614, an unimproved 802.11g unit with no super, max or other tweaks, just bog-standard 802.11g, so any higher specification adapters should inter-operate in 802.11g standard mode.

Bluetooth is NOT what you want.

You need 802.11g, in either:
USB: To fit anything with a USB port.
PCMCIA/CARDBUS: To fit a laptop that has a PCMCIA/CARDBUS slot (but lacks integrated Wifi) - caution, older slots may be 16 bit PCMCIA and not compatible with 32 bit CARDBUS.
PCI: The least common adapter type, but probably the most efficient for a desktop, though internal fitting is required.