For what its worth I agree with Mike.
I think its an Axminster weave, possibly a 'b'grade although the pics arent great, the carpet doesnt have that 'gloss' a BW has. And a BW tends to have regular 'pictures' of patterns, this doesnt.
The pattern looks familiar but not as BW, perhaps one of the guys on here that has a carpet shop can name it, that would help.
Ask them in the restaurant if they know the carpets history, although an Axminster is relativley dear it may have come from a pub that was being redone etc etc.