CM
I know a lot of the guys on the current contract, who stayed on when Aegis 'won' the Raymond contract and they were all RMP Close Protection Qualified, not necessarily all ex-RMP, although the majority were/are.
I'm ex-RMP CP myself, it's not hard to work out from my 'avatar', I've never worked for Raymonds or Aegis but, I don't see it as any different to current companies working in Iraq, such as 'Pilgrims', who only employ ex-SF personnel. Infact you'll see on their website that even Aegis are now advertising for ex-RMP CP types only to fill certain roles.
The thing is there is only one British Army unit providing highly trained AND very experienced CP Operators from Management level down to Operator level and that's the RMP Close Protection Unit. Who wouldn't want to have these teams looking after them? Last year the CPU/FCO celebrated 25yrs of working together. You don't maintain that sort of working relationship through being crap at your job.