Not in the UK, but just throwing it out there! :-)
I have a G5 PowerMac if your interested. Here are the specs below:
PowerMac G5 Dual 2.0GHz
2.5GB Memory
310GB Total Storage (1 x 160GB and 1 x 150GB, used in a RAID config)
256MB Graphics (ATI X800XT)
7 x Firewire 400 Ports
6 x USB 2.0 Ports...