these will hit for sure in 2021– The UK still thinks they can afford to play games with BREXIT
So yes, you might go back to 60-70% sooner, but the full recovery will only happen when the scared people go out again and this will last longer if openings are done prematurely and they feel unsafe.
For myself for instance I think that 1-2 days of work from home will be the new normal for many years to come but for someone working at a super market, this is not an option.