As it happens, I did actually go to both on Friday evening. Started in the CCR and had the salmon starter, followed by the Concorde Roast.
The salmon was actually very nice; reasonably well presented and tasty (apologies for the poor picture quality!).
Smoked salmon starter
The Concorde Roast, on the other hand, although nicely presented, was probably the worst piece of meat I have ever eaten! I had put most of it back on the plate as I couldn't actually chew it. In fact, the edges were not just un-chewable, they were actually un-biteable. Very disappointing! I asked for it medium rare, and that's how it came, so will try it medium or medium well next time to see if that makes a difference.
Concorde Roast
I went for the burnt cream for dessert, and that was delicious, but had a gaping hole that could only be filled by pie and mash, so popped through to the F lounge before my flight