Keyword of the week

london skyline explained

Quite innocuous, this week's. But I just like the idea that somebody thinks it needs explaining. I have this image of Hugh Laurie doing his best upper middle class twit gesticulation and saying 'Well, this won't do. I demand an explanation!'

Tell you one thing that does need an explanation though. The strange protrusion in the photo. Aside from looking a bit like a shark, and maybe having some use as a deterrent to passing tuna, I can't think what its purpose is.

Any ideas?