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What is postal code number of united kingdom- London?


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depends where you are in London, the House of Commons is SW1A OAA and 10 Downing Street SW1A 2AA. Broadcasting House W1AA 1AA

There is a book at your local post office with all ZIP codes in it. Please ask the clerk to look it up for you, and if it's for a Holiday mailing, get moving. It's slow going.