I was in T5 too and I'm just leaving as my flight was binned. Chatting to an old HAL pal I bumped into it seems that the airport has "suddenly" realised they're very short of staff in the Baggage control room and security. Expect rolling cancellations today, which is the worst you can have.

This is why getting rid of the ticketing people in the airport was a bad, bad, bad, bad idea. But it's not like Cruzie and his mate Tom Stevens were listening (or are around to pick up the pieces!).