I'd call them. Would be pretty ridiculous if you can't do that over the phone for at least the next month or two.

And this... I expect this will be what we have to do soon, but as things stand, I'm expected to go unless I'm in self isolation, and that would also mean not going to Oxfam, which in turn means they probably have to close, since I'm one of the few that work there under the age of 70. I'm expecting to have to work extra shifts over the coming months, something I'm more than happy to do so long as I'm well.