More and more shopping centres are getting Chargebox Facilities. Examples are Manchester Arndale (food court, exchange court and winter garden) , Leeds Trinity, London Westfields East and west. It's a column in middle of mall/food court etc with 5 secure lockers. You just pop your phone in, connect to right connector, close the door, lock, take away key and return. If you're more than half an hour it stays locked all day so you don't need to remember what time you put it in.