The exemptions went to BA (15), QF (2) and SQ (?) - but only in the Northern Summer (our winter) - because a flight from London will effectively get here two hours earlier (they are +1 and we are +10, compared to +0 and +11 in our summer).
Importantly, they are scheduled to arrive prior to curfew. This is not an option for aircraft scheduled to arrive after 0600 to land early.
This definitely did not apply to SQ221 today. They either were classified as freight, got a one off exemption, or just paid the fine.