Sorry if this has been posted already, but didn't see it in the list:

Marco Pierre White Steakhouse, Birmingham UK Link 25th Floor of The Cube

There is also a decent bar attached to the restaurant and the outside area is nice for when the weather is good. There is a Hotel Indigo on the floor below, well worth a stay if you have some IHG reward points to spare. You don't need to be a hotel guest or be eating to use the bar.

I've stayed in the hotel, had drinks in the bar and had breakfast in the restaurant the next day. All pretty good. The restaurant is rated by an acquaintance who is into his food.

Some decent pictures on Trip advisor.