As OC&C is confederated rather than one firm per se, the closure of these offices should not cause alarm - and anyway both regions could be served well from other more prominent offices. If you are going to be a consultant crafty look past the headlines and try to figure out the business issues and rationale behind it. As long as you are joining a significant office - London say - then don't worry. It's an excellent firm - get in, get a couple of years under your belt, then look to move across to one of the larger firms.