We were going a tour encompassing the palace of Westminster, The national portrait gallery and the cabinet war rooms so Old Shades was right on track. The plus points is that the menu is good and, for the area not overpriced, we were allowed to sit without reservations at a prime table reserved two hours later and the place is architecturally very interesting with a good atmosphere. I had a burger which, at £12.90 was expensive but it was fully loaded with bacon and cheese as well as the usuals and fries and was very juicy and flavoursome. My wife's corned beef (think USA not canned) hash was also very good except the poached egg that accompanied it was overdone a little so did not flow. We saw the sausage and mash at another table and will certainly be back for that! Two large glasses (250cl) of Claret at £6+ each were pretty good too.
It got quite busy and the service started stuttering - water eventually came with lemon but no ice, the greek salad that was mentioned as a side with the hash never materialised and was denied by the second water that took over our table and it took a while to get the bill; apologies were given and the full restaurant blamed but whose fault is that? So not perfect at all but 4 stars overall because we would return again if only to further delve into the menu.