Westminster City Council has now provided a fuller page about coronavirus – https://www.westminster.gov.uk/coronavirus-advice-and-information – which includes the following under ‘How you can help’
“We’re getting many enquiries from local people and groups asking how they can help in their local community, particularly when considering supporting more vulnerable groups.
We’re grateful for the amazing community spirit and would ask anyone who thinks they would like to help out to register their interest using this form https://www.westminster.gov.uk/volunteer-help-your-community
If you are involved in a local volunteering group please send us through the details to: firstname.lastname@example.org so that we can help publicise your activity to those who need help.
If you need help or you know of anyone who needs help please email: email@example.com”