I had a lovely Sunday lunch with my wife at the Duke yesterday. The veg in particular was some of the best I have tasted. We both had roast sirloin and were not disapointed. It's not a cheap place by any means but the food is a real cut above and the service very attentive. If I did have a criticism it's that some of the wine is a bit toppy. The bar is also very nice for a drink. You get a nice crowd there as well so it really is one to try.
If you want to contact me twitter @alittledavetime is best