In reply to CMMCLakesclimber:
To be honest, you need the North Cornwall and Devon guide, which runs along the north coast, from Carn Gowla (eight miles north of Truro) right up the coast, and the SE Cornwall and Cheesewring guide, which goes through the Bodmin bouldering spots and along the south coast from St Austell eastwards.
The West Cornwall guide only really covers Penwith (the area around Land's End), with a couple of outlying crags.
Both of these are available from all good bookshops etc etc.