If I think about the wider issue then the old Vicar Of Dibley image of England I love is dying. It's a real shame and I think it's sad that rebels in the muslim community forced their own heritage into our lives faster that in other western countries and started to diuted the way of life that I grew up with but for others in other regions.
I know village life in the sticks isn't directly linked to a mega mosque in London, but it's the start of the tipping point from whence there's no going back. Their faith is taking over the world and one day instead of the churchbell ringing on a sunday morning that I grew up with, we'll have chanting 5 times a day like they have in muslim countries.
Being the biggest place of worship in Europe too sends a very strong message that I don't want. We might not be Christians as a nation, but christians are non threatening to my way of life, but the muslim faith might one day be.
If the plans were for a Swiss, German, Italian, or French city then it would just be a pipe dream and never get beyond planning stage, but thanks to our weak politicians and council leaders trying not to upset the muslim demographic in particular and less worried about protecting our own heritage then this will probably pass to the building stage, cost far more than the estimate, then have the British taxper pay the extra which will probably be at least double the original estimate for the project.