It's hard to know what to do. I went out this afternoon to the shops and it was busy enough around the place. Once some shops open on Monday, (non-taxi) things will get going pretty quickly.
But, logically, Monday is Phase 1 and Phase 2 doesn't start until 3 weeks later. So if you feel you can't go back to work on Monday, you probably shouldn't go back for another 3 weeks, i.e., Phase 2?
I'm thinking going back 2nd June, after the Bank Hol weekend? Or maybe the Fri of the Bank Hol?