There are also other great bookstores that are further in London but worth a visit anyhow. Their details are listed below.
Tel: 020 75834835
Opening Hours: Mon, Tue, Wed, Fri, Sat, 10.00 - 5.30
Thursdays, 10.00 - 7.30pm
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Tel: 020 7735 7076
Opening Hours: Monday-Friday: 10.00am - 5.00pm
Saturday: 10.00am -1.00pm
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There are also excellent research libraries in Central London, Dr. Williams Library being one of them. They house the original minutes of the Westminster Assembly.
Another is The Evangelical Library which is home to more than 80,000 Evangelical books. You can find their contact details by visiting their website. They also have an online catalogue which lists' most of their books.