It does not happen “for the duration of the summer”, it is usually only for a few weeks and in a few locations (which, coincidentally, have a high percentage of Middle Eastern expats.). You do not see Ferraris cruising through Shoreditch and with the exception of one douche who drives a gold Lambo down my road every weekend as he heads off somewhere to show it off I have never seen one of these cars actually being driven. Parked near Harrods or Green Park begging for attention, yes. Driving around? No.