Was in London back in '11, sounds so long ago hahaha and saw quite a few of these boys booning the streets (we stayed just behind Harrods where a lot of these shots seem to be taken). It's awesome in person (not all that publicly acceptable, but anyways) and I noted that most, and you can see it in the vid, are young Arab/Saudi guys who fly their hot rods over for a week or so whilst they are ther staying in the mega hotels.
Here's one of my fav shots from London.