Boswell Hill and Camberwell are both in London. The song I know goes:

Whilst rowing for the Varsity on boat race day
He 'caught a crab' and masterbated all the way
They won by half a length but were disqualified
For buggering spectators on the Surry side.

Chorus

Craven A, never heard of fornication
Craven A, never dipped his Tool
Craven A quite content with masterbation
Thought a cunt was something you were called at school.

All sung to the Caey Jones tune.