Here's a place you can eat and drink right at the heart of Westminster just across the road from the Houses of Parliament. We met for a business meeting and people chose a range of different dishes - fish and chips, ham, egg and chips and I chose potato wedges with mushrooms, tomatoes, onions and melted cheese - this was served with a garnish of fresh salad and was quite frankly yummy. This and my drink came to around £5.50 - wow - how cool is it to be able to go and eat in Central London and not get ripped off! Very good value for money. The waiter looked a little confused between orders and tables, but he was pleasant and happy to help and we didn't have to wait too long for our food.
Down sides - not a lot of room. Up side - good air conditioning so it was restful and relaxing and you weren't struggling with feeling stifled. Would definitely go there again.