Yeah, they shouldn't really have a problem. The engine is also found in the Vauxhall Omega, and numerous BMW 2.5 diesel cars with it being a BMW engine (I've just changed the engine in my wife's P38 with one from a BMW E36 325tds).
My main complaint about most garages now is that they no longer repair things, instead replacing them. I would suggest however that you find out what warranty is supplied for the refurbished pump and the warranty for the work carried out just incase you have any further problems. Also, did you authorise the garage to carry out the work or did you just ask them to find out what was wrong? Did they give you an estimate at the very least for the work before starting because I'd always insist on this so you can speak to a couple of garages to find out if you are being charged a fair price for the work?
Will ask about the warranty thing. I think they took it as given that the job was theirs as the AA man had dumped it there and they know I need it for work as soon as. They did say it would be £800 for the refurb on the unit and then labour on top, indicating its a big job to remove it and re-fit? Local landy specialist said he would have put unit on from breakers yard, not bothered with refurb'ed unit as an R reg RR not worth that sort of money. Anyone agree with this?