Under or around £100 (most s/h) and better than a Hurricane:

HW40 and copies (P17 etc)
Webley Nemesis
Gamo Compact
Gamo Center
Gamo PR-45
LOV-21
Diana LP5/5G
Diana LP6/6G
Daisy 717/747/777
Oddball: Predom Lucznik

The Daisy feels cheap, but is a better 10M target pistol than, eg, the Crosman 1377 or 2240.

You might get an FWB 65 for £150-170. If you can stretch that far, job done (ditto with a recently re-sealed Diana 6G).