I agree with Stephen. You are recording the light from the city scattered from clouds and dust in the sky. The solution is to wait for a clear sky, then it will be black, at least in shortish exposures. Also, if you want a bit of colour, you can wait for a nice sunset. If you take a look at the postcards sold in central London newsagents you will see some good examples of this. Of course it is easiest if you live in London, as you can never be sure quite how the conditions will turn out. I suppose these days we should all be taking pictures close to home to avoid needlessly burning fuel.
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