On Sundays, many shops and restaurants are either closed or close rather early. There are not too many 24 hour stores in London, but if you can find one they are a life saver. Some Food and Wine stores and Tesco Express are open late and these places definitely come in handy if you are a little hungry or suddenly remembered you were out of milk, eggs, cereal, etc. and you wanted to purchase these items before the next morning, even if they charge you more.
