All good stuff gents, thanks.
It is a 6 saddle bridge, and thinking about it, he does break strings on the acoustic a lot too (S&P with a tusq bridge).
Maybe Commando Jack has a good point with the strumming technique and thumb thing...
There are a lot of detunings from standard to drop D and, I think, DADGAD sometimes. This probably doesn't help either...
I'll look at the winding length thing too, cheers Big Stu