We've been having gorgeous sunsets in London all week. Tonight's is particularly lovely. It began half an hour ago, with a gentle pink band across the deep blue, like watercolour on wet paper. Then came slashes of red, orange and purple. Right now, there are violent neon splashes of orange and vermillion.

Ooh, and looking out of the other window, I see that a huge full moon is hanging low over the horizon. And it's pink. Ooh, now it's orange.

I'd appreciate the beauty of it more if I didn't suspect that it is merely an indicator of high air pollution.