Hi, Paul,
I'm afraid I wasn't successful with your look-up, as when I got to the CCRO late this morning the place was absolutely stuffed with people (all of whom had pre-booked), and I was lucky just to get the last remaining seat there (until they re-locate, it's just about the tiniest County Record Office you could imagine). If anyone else pre-booked had arrived after me I'd have been unceremoniously turfed out. This meant that I was only rapidly able to do look-ups in parish transcriptions for people, and the story on St Peter's Wisbech is that after 1800 they're only on microfilm - and every single machine (there aren't many) was pre-booked and in use; the Wisbech St Mary registers beyond 1813 fall into the same category...
I did look in Boyd's marriage registers 1801-1837, but no sign of your Vincent BOUCH, I'm afraid. Next time I go (NOT during holiday time!), when things are quieter and less frantic, I'll look up his baptism and marriage if you still haven't had any joy with it...
Sorry to disappoint you,
Very best wishes,
Keith