Thanks, not sure how easy it is to find RRS stuff in the UK, but I'll have a look.
Do you know if the lens feet are interchangeable? would a 400 2.8ii one fit? I've read conflicting things!
I use a mail forwarder to buy stuff in the US and then have sent over to Australia.
Is that a 400 2.8 IS II? If so then it should according to RRS