From Kew Safer Neighbourhood Team:
Just to make you aware that we are receiving reports of a male knocking at doors stating he is collecting sponsorship money for a charity bike ride that he did around Christmas time, he appears to be targeting women over 60. When asked if he has the sponsor form or any sponsor ship details he disappears, often on a bike. On some occasions he has called the occupants by name.
Description is male, white, smartly dressed, has been seen in a leather jacket, sometimes on a bike, age has varied from mid 20s-40.
Please do not give any money as this is a scam.
A compilation of reported scams can be found here.