This comes off the back of guidelines last year that a school should inform parents if their child wishes to be recognised as a gender not assigned at birth when they're at school.
As evil as Section 28 was, it didn't require schools to out gay kids to their parents.
Section 28 was a clause in the Local Government Act amended by the government of Margaret Thatcher. Where schools were banned from discussing homosexuality in any manner that could be interpreted as positive.