I like the Italian and tapas like foods to share at Polpo (I've been to Covent Garden -there are other locations no reservations reasonable).

Steak is expensive dinner I like Barbecoa (Jamie Oliver) in the city (pork chop amazing, burgers good too, never had steak but friends like it) for the views of St.Pauls at night and then take elevator to roof for night views of the city and closer St Pauls views - I love this secret spot

steakhouses -Goodmans has cozy booths - I also like Hawksmoor (food over atmosphere)