Gold-buying con-merchants on local estates

Beware - this week con-men have been leafleting estates in the Kilburn and Swiss Cottage area, offering to buy small amounts of gold people have for cash. They come back after an hour and knock on doors, trying to buy gold at a very low price that bears no relation to the market price. It seems a couple of people may have been caught out. Please keep an eye out and report any sightings to the local police team.