I just found this thread from Google.This thread came up as the first reference in Google to Red Ball and Bayer group

The Red Ball man just called on me here in Wimbledon SW19. The description fits - ginger hair, about my height (5 ft 9). Mentioned the Bayer group only after I asked him who he was and who he worked for. I interrupted his patter and took a stroppy tone because I don't like people who ring my bell and don't properly tell me their business. I told him firmly that I wasn't interested in having an exterior survey and sent him on his way by closing the door in his face. I could see he had a couple of others with him as he went down the street. I don't think my neighbours answered , but the lady next door is 87 and rather vulnerable to this sort of thing, I will call on her later.

Thanks to people on this thread and Scambuster, for putting me in the picture, it seems this lot have been active for a few months now.
Paul Horth