What about this? (tower only, no screen/keyboard etc) currently at £90

Chip Type: Intel Celeron
Processor Speed: 2.2 GHz
Memory (RAM): 512 MB
Hard Drive Capacity: 40 GB
Brand: Dell
Primary Drive: CD-RW
Features: Modem, Operating System, USB
Condition: New

Dell GX60 Black Tower Computer,

Celeron 2200,512mb DDR Ram, 40gb Hard Disk Drive, Sony CD-RW Rom, with 2 x USB in front. In rear Serial, Parallel, 4 x usb's, 10/100 and Sound.

Updated hardware:

Another 256mb DDR Ram to increase to 512mb's
Radeon 9200 SE (128mb DDR Memory Graphics Card)
Installed software are:

WINDOWS XP PRO
NORTON ANTI VIRUS
OFFICE 2003
NERO STARTSMART (Burning Software)
ROXIO EASY MEDIA CREATOR (Burning Software)
POWER DVD v5.0
Dell Music Match
Games Installed are:

Grand Theft Auto - Vice City
DOOM 3
Alien vs Predator 2
Unreal Tournament 2004
Driver
Starsky and Hutch