Chris have heard of wire being used before and even plastic cable ties though I don't know if either would satisfy the MOT test, will have to make some enquiries, unless someone can confirm this one way or the other.
Stuart
Gee, I didn't know the MOT guys got that fussy, but fair enough. If they won't allow wire but will allow 'cable ties', I can highly recommend these in nylon
http://www.carbuilde...e-ties-100-pack
Instead of the end coming through the tie at 900, them come in the end, so when tight, are flat, no leaks. Also, they have a lower profile, so as they spin, they don't get knocked off on the hub. For the bigger end of the boot, joint two clips together. They do have longer versions available, however, I've found them too wide for CV Boots.
If they don't allow them, then Stainless Steel Cable Ties are available, though not cheap
http://www.carbuilde...teel-cable-ties
I used similar ones for many years, while good, if you don't get them very tight, they do come off easy and they are not easy to get tight.