I think the Handling Agent gets a rough deal sometimes. If ATC can't cope with number of flights they can restrict the flow... If the plane goes tech or there are crewing issues the airline can cancel or delay as appropriate... The Handling Agent just has to deal with the flights as and when they turn up, regardless of the staffing levels at that time. The Airline and the Airport are quick to shift the blame onto the Handling Agent in this case, but both need to look at their own houses as well. Most passengers don't differentiate anyway between the Airlines and Handling Agent, it will be the Airline that they 'won't fly with again' and Stansted that they "won't fly from again' after these issues.