1) Godreavy (North Coast), around 30 minute drive for you - best place in Cornwall - tidal compact sandstone
2) Clodgy Point (St. Ives), around 40 min drive for you - 2nd best place - non-tidal greenstone
3) Gwenver (Lands End), around an hour drive for you - 3rd best place - tidal granite
4) Carn Brae (Cambourne), around 15 minute drive for you - very good - inland granite
5) John's Wall (about 15 minutes drive from you), only decent indoor wall in cornwall - listed in some guidebooks for directions - very freindly and cheap
6) Rinsey Head - (about 20 minutes from you) south coast, some good problems there - Tidal granite
7) Secret spots - (too many to list here, many are excellent)