FlyZB:
Yes, but as MAG owns the brand that is Manchester Airport, it has a duty to protect that brand, and the service levels to its customers. I believe it has various user groups and performance review meetings with the service partners to ensure that stakeholders' performance and plans are aligned with MAG's plans. It also has a Director of Customer Services, and a huge team below him, to ensure they get it right.
I believe the problem is due to MAG driving down its own costs and increasing its income to free up cash to reduce charges to attract airlines (which only worked for a short time anyway). This has resulted in the service partners also having to reduce their costs to stay afloat (e.g. Initial) and the retailers having to increase their concession fees and rents to stay in the game. For both groups, their main cost that is adjustable, in a labour-driven service industry, is wages, which are far lower in real terms than they used to be. Coupled with staff car parks being further away and too small, and alternative employment easier to find (Trafford Centre, Wythenshawe office developments, Sharston, Trafford Park, Warrington etc.) then it's inevitable that the workers that keep it going (shop staff, cleaners, baggage handlers etc.) will walk, and service levels will collapse.
Management have been told numerous times this would happen. They haven't listened. It's Thatcher in 1990, and Blair/Brown in 2008, all over again - the ruling class losing touch with what the people are doing.