For anyone who's interested, looks like I'll be combining a USB extender:

http://www.lindy.ie/usb-extension-cat5-usb-extender-up-to-50...

With a Logitech USB Quickcam:

http://www.amazon.co.uk/Logitech-QuickCam-Pro-9000-Webcam/dp...

I'll update again if/when I get it working!