Amendments to Use Classes Order 2020 - Public forum - Planning Advisory Service (PAS)

The Government has heralded these changes as helping the High Street and Town Centres but nowhere in the regs does it refer to defined Town Centres, as far as I can see this will apply across all areas in England. If my interpretation of the new Class E is correct a large B1 shed on an industrial estate could change to a supermarket without planning permission. Also when the regs talk of the "material period" being 1/9/20 to 31/7/21 - is that a temp permission granted by the regs for only that timescale or could a change effected by these regs continue to be extant beyond July 2021 if implemented in the "material period". I know we're waiting for the PPG update but anyone have any initial thoughts please?