The Herne Hill Safer Neighbourhood Police team report that gutter cleaners have been canvassing the area – indeed, some have been leafletting here in Fawnbrake Avenue.
They offer to clean the gutters, then miraculously discover serious problems in the guttering, or roofing (even removing tiles to create a problem which they can then demonstrate).
It is better to use recognised roofing firms to check out any suspected problems in gutters.