From my perspective I would be interested to know:
What happened to the monitoring of the original contract?
Was that sufficiently robust with the correct Key Performance Indicators (KPIs) in place. If not why not?
What money has been recovered from the original contractor for failure to deliver, this could then offset some of return to flight costs.
Following the grounding why did it take 2years to get anything moving? It only took 3 years or so to get an availability contract in place for the dear old VC10! Sure there were challenges, but all parties worked together to overcome them on a vastly more complicated aircraft.
I might as well drop these questions to my MP, he has served on the PAC for a number of years and would be well versed in taking these questions forward.