Nah, chances of getting one in the UK are pretty close to zero I believe. Add to that the fact that it would probably cost a 4 figure sum...... no chance!
I think my best bet would be to try to get to the Island itself and see them in the wild - thats my lifes ambition anyway :lol:
I've seen shots of them in tanks though... apparently they are quite hardy members of the Holacanthus group. Diet, space, tankmates are main concerns, behaviour is typical of the group IIRC.