London is a megacity of England/United Kingdom and even the world.

The current capital of the United Kingdom: formerly a county in its own right (1889-1965).

The geographical area covered is roughly the M25/the extent of the London Transport network.

The Wikipedia page for London is [1] and for England is [2]. There is also a small England wiki at [3] and a smaller Britainpedia Wiki at [4].

If you have ancestors born or married in London, you may find their names at w:c:familypedia:London/bdm or w:c:familypedia:Greater London/bdm.