Bingo to the above really guys. Wheelspin will actually help prolong the life of the box in some ways - as you've highlighted if it doesnt spin but you still try an put the power through it, something else has to give way - normally 3rd gear
Titch always said it was a mixed blessing going BE - he said the MA was the most fun thing he'd ever driven but at the cost of reliability. The BE is less raw but more reliable. From what I remember of brents (non diff, MA) that thing made a bee-line for the hedge everytime it saw a wiff of boost