The Inspector Calls (S02E05)

Panic spreads amongst the teachers when they're paid a visit from the Witch School Inspector. The particular individual appointed to inspect Cackle's Academy is none other than Mistress Broomhead, Miss Hardbroom's tyrannical personal tutor from witch training college. An emergency plan of action is drawn up and, in order to prevent any unforeseen disasters, Mildred is banished to her room. (Prime Video)