I’d been wondering whether it was possible to make cash contributions to food banks when this blog post by print journalist Esther Coren fell into my inbox: https://onthespike.com/2020/10/27/bankuet/
https://www.bankuet.co.uk/ is a platform the lets you make a one off or regular donation, and route it to a specific food bank (Wandsworth is one of those listed).
If you are like me in having lots of good intentions but regularly fail to remember until you walk past the donation point at the exit of the supermarket - or indeed if you grocery shop online -I think this donation platform is a great idea.