What goes around, comes around
With both the original outsourcing to EDS and then the setting up of Aspire for the next contract, the contract terms were set by the Inland Revenue, then HMRC. In each case it was the government department that agreed to the service levels and the charges. As both companies met the agreed service levels* and charged the agreed fees it's a bit disingenuous for them to start bleating about the cost now. They got what they wanted for the price they specified. In the meantime, there has been a lot of tax collected reliably and on time.
There has been a move to using smaller suppliers of late, which in many cases has led to announcements of the bold and thrusting innovation taking place as HMRC employs two people from over a chip shop to do what the vast corporation wasn't sufficiently agile to do. This works well for a month or two, then something has to be deployed in a controlled and reliable manner across a wide, secure and mature network and ChipShopSoft discover that you can't just send someone round the country with a USB stick in their pocket and things hit a roadblock. That's when the Aspire behemoths step in and offer to fix things for large amounts of cash. This bit gets hushed up, the job gets done and Fujitsu and CG collude with the powers that be as it's good business. Every time they lose a small piece of business they just wait. They know it's coming back to them with extra fees attached because now it's both broken AND urgent.
I'm quite glad that I'm out of that environment now. It was an interesting ride, but exhausting at times. I have a lot of sympathy for my former colleagues and wish them well in the GovCos and SMEs post TUPE.
* There were monumental screw ups under EDS, but in each in case EDS said, "Do you really want us to do this? This is A REALLY BAD IDEA", then the Inland Revenue came back with, "We pay, you do" and EDS shrugged it's shoulders and said, "Chump don't want no help, chump don't get dick help" and helped them to make the mistake that they were paying for. I know, I was that soldier.