[123pie123]

like the idea but how much sun does london really get?

[hobofan]

Enough to allow a skyscraper to melt cars[0].

[0]: https://www.bbc.com/news/uk-england-london-23930675

[jacquesm]

That's a bit of a special case though, at 50 suns or so it doesn't require much for that effect. Great demo for solar concentrators though!