Any luck getting in contact Richard?
Just ripped out my S1's trailing arms and have discovered some impressively worn splines, had the reinforced Triumph puller out and everything but the hub just fell right off the axle. I'll probably need both the axles and hubs.
Looks like Banks has the hubs and shafts for £1k GBP (1 car set)...if he would reply to emails at some point.
I recall seeing some solution kit on eBay as well, but all dead links now.
I'd rather not deal with going too far from the book on these; pretty sure modifying the original parts is completely out of the question. Not enough material left in the hub.