Banned larger indoor mass gatherings immediately after Feb half term. However, I think anything smacks too much of hindsight.
I wouldn't have made any changes to our lockdown, as I never thought it needed to be stricter other than maybe saying exercise was for one hour (just to stop people going on the stupidly long bike rides which promoted 5 mile restrictions in Wales and Scotland, which in turn were stupid).
I wouldn't have bothered with quarantine because barely anyone was flying anyway and those who were, were coming from lockdown areas.
I wore a face covering from the outset so I might have recommended them, but they weren't available at the time, I used a runners' snood.
I would have set up a one way system - left hand pavement,stay on left, single file, to stop all the conflict between runners/cyclists/walkers/family groups on scooters etc.
I would not have allowed the parks to be closed, it was clear from the outset that it wasn't going to spread outside.
I would only have allowed furlough to the sectors that were closed down, to stop employers abusing it who did have work to do like airlines needing to refund people.
I would have allowed garden centres to keep their outdoor garden bits open throughout.
I would have allowed outdoor pools to open more quickly.
And I wouldn't restrict groups to 6 outdoors now. 6 inside, 12 outside.