After a false start with the 433 that was advertised on Milweb for £6k, I found myself another one thanks to Sharkey who tipped me off. The pack was removed to fix a gearbox problem but never found its way back again, so I've got an interesting jigsaw job to reassemble the pack with the guts of a 432 one.
Once I've got the pack sorted I'll think about the gun, which is currently deactivated. I've heard of people holding these on a FAC and it would be nice to put blanks up the breech for shows.
The company I bought this from has another 433 for sale, in roughly the same sort of state but a runner. PM me for contact details if you're interested.
Andy