Local Covid-19 mutual aid groups in many areas
My local group (covering Hackney) is on Facebook and helpfully lists (under its Announcements tag) all the ward-level groups, which are using WhatsApp to co-ordinate their efforts. I can't use WhatsApp, but the discussion on the Facebook parent group gives me scope for helping to sign-post others to what they might need.
The few other boroughs that I've checked also have ward- or street-level sub-groups but those may be using other IT systems, rather than WhatsApp.