Door to door collectors for the charity Oxfam are active in Harbury and this much has been confirmed by Oxfam ( telephone 0300 200 1300) to me. Furthermore it is their intention to canvass post code areas CV1 through to CV47 over the next few days/weeks.
It is likely that these collectors are agency staff working on a commission basis. They can be very persistent and are expert at overcoming objections. It is not a good idea, in any circumstances, to give details of your bank account and/or a specimen of your signature to a stranger.
If they will not take ‘no’ for an answer, if they become aggressive and/or if you feel threatened, you should call the police on 101.