I think it is nobodies business but mine as to which charities I give money to and how much. I have no feelings of guilt or anything else when I bring these phone calls to a short sharp end, before they can even get properly started on their script. I just ask them if they are ringing from a charity and asking for money.
If the answer is affirmative, which it has to be. I tell them firmly that I have a portfolio of charities I donate to and I review the list regularly and they are not on it and can do nothing to get themselves on it. If it is a charity on my list I make it absolutely clear that if they do not take my name off their list with immediate effect on the receipt of the next phone call I will cease donating to them - and I have done so.
Do not let these people put you on your back foot. Take control of the situation yourself and put them on the defensive. It can be done.
Estranged Son and Future Granddaughter
To think that London, or anywhere else for that matter, does not belong to any one demographic