The British Library holds a variety of books which are available for lending. There is also a reference section. They also host some exhibitions and also have reading rooms. Admission is free.
Directions
By train
Kings Cross and St Pancras International and Euston
By Underground
King's Cross St. Pancras, Euston and Euston Square
By bus
Many services: including 10, 30, 59, 63, 73 and 9