The workman in question was doing some work for me. He told me that he went to answer the doorbell and found that the postman was being harassed by two young men - in their twenties, black, wearing shorts but no shirts (sunny day). They had apparently been following the postman for quite some time. They were very unafraid and weren't easily chased away until they realised the police were on their way. Lewisham police were there very speedily and spent quite some time patrolling the local streets to see if they could find the two men but without any luck.

I know the postman was back at his job pretty quickly too and can only hope that this experience hasn't affected him too badly.