Speaking for France, this is already a non-starter. All gigs are 'off', end of, at least for the next two weeks, and, in all likelihood, for much longer than that. If the UK has not yet announced similar measures, I'd take it as 'said' that it won't be long at all before the same measures are imposed. If there are gigs beyond this coming week-end, I'd say that they are already effectively cancelled. Maybe France is a little bit more hard-line for the moment, but the UK will be, in a very short time, in the same state. Stay at home. Don't go out, at all, except for very specific, essential things, such as getting food or medicines. Gigs..? We'll see about gigs later on, when Summer's passed, I reckon.
Sincerely hope this helps.