London Sleevers - Could Use A Little Help

I will be spending the next week in London at the Holiday Inn Mayfair. I am 10 weeks post-op so I can eat almost anything, but I have managed to become a bit lactose intolerant so I have had to give up on most Protein shakes and rely upon real food. (Protein shakes were difficult to travel with anyway).

I could use some tips on local sources of Protein that I can pick up while I am in town. Are there any brands of Jerky, greek yogurt, or other foods I should look for? I am also interested in restaurants and such as sushi bars, tapas, and such where I can get some good protein without too much fuss. Finally I would appreciate ny tips you might have about eating local fare (pubs, curries, etc).

Thanks in advance....