Smith's serves the Arora Hotel near Heathrow - it's located by the lobby in the same building (good hotel for Heathrow ovenight layovers, incidentally). I just ordered room service and it did a great job of embodying the stereotype of terrible British food - pizza served in 'freshly baked' cardboard box in a weak attempt at fooling you into thinking it's pizzeria quality but oh so very obviously store bought, and we're not talking high end of the store-bought range here either, we're talking limp, rubbery, stale with scant toppings. Green salad was nothing more than a small bowl of chopped iceberg lettuce with a few pieces of cucumber & avocado here and there. Together with a bottle of water this all came to GBP19.50, yes that >30 bucks EXCLUDING room service charge. You are WAY better off ordering delivery from one of several nearby curry houses. Come to that, you're almost as well going to bed hungry. Overpriced rubbish - avoid.
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