The Londonist, a “website about London”, believes that:
You don’t have to live in London long before you get offered a pair of bargain “high spec” speakers out of the back of a white van. It’s like a coming-of-age ritual…once you’ve been offered some dodgy stereo equipment you can truly call yourself A Londoner.
Well, that’s exactly what happened to me once while I was walking along Holland Park Avenue. I’d no idea it was a scam, let alone such a common one! Of course, I’m far too straight-laced to even consider such an offer, but I also had two pairs of stereo speakers that I wasn’t using, so no harm was done.
Guess I’m a Londoner now though!