We went on the 10.30am tour which I thoroughly recommend. You get to see behind the scenes of the British Library and to understand how they keep and catalogue a copy of every book ever published. Magazines and newspapers too. You see inside the Reading Rooms and are left at the end to explore the permanent exhibition on your own.
There's a cafe, a restaurant, plenty of toilets, a large cloakroom and a very nice bookshop.
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