WHBM......Heathrow Tower is short of staff. It has been for the eight years I've been there. It's very bad at the moment, as there was a pause in training while we prepared for the new tower move and then again after we moved as we got used to the equipment.
As things get busier and more complex, with fewer staff, we all end up working harder, value our time off more, and so less likely to agree to come in for overtime.
It's not going to get better for a few months yet.