Is this a good pc for a 100 pound ?

Intel e8500 @3.16hz
HD4870 512MB
4GB RAM DDR2 1066
700W Coolmaster PSU 
1TB HD
160 GB HD
Antec 920
The seller bought it custom made in 2009 but I think it play recent games at a decent level . What do you guys think ?

Yeah definitely. That CPU cooler alone is worth about £70.

Seems pretty good for the price.

You should be able to play games at medium settings.

Intel e8500 @3.16hz
HD4870 512MB
4GB RAM DDR2 1066
700W Coolmaster PSU 
1TB HD
160 GB HD
Antec 920
The seller bought it custom made in 2009 but I think it play recent games at a decent level . What do you guys think ?

7MZ000

For a hundred quid, I'd certainly go for it.