What happened was more complicated.
Hull had the choice of staying where they were with the 222 fleet (which was highly profitable) and going for a straight TA renewal or going for a longer TAA with 5 cars.
So they started asking around the market about 5 or more cars, new and secondhand and working up various business plan scenarios.
Then the DfT and Sir Moir got talking about releasing the 222 fleet to East Midlands. This was all tied up with something else going on with FG and the DfT at the time and FG were not in a strong position. So the 180 fleet came in as the “perfect” solution for everybody, except HT weren’t too keen because of their reliability. But they had no choice in the matter.
HT then had to get a deal together to get the requisite years on a TAA contract to match the investment needed to go 5 car cl.180 & to get the things up to some degree of reliability. 15k m.p.c. was the figure agreed - the ORR wanted much more than that (25k m.p.c. was mentioned!) but it was pointed out to them that these things were the DMU equivalent of class 50 locos - when they were good, they were very good but when they were bad, they were very bad!
All was relatively ok while the maintenance for the units was done at OOC. There have been the odd occasions when material supply has been an issue, most unfortunately as the units were being transferred to Crofton but it has been Crofton maintenance that has really been the recent issue. It just isn’t working as it should and, without going into detail here, it is an issue which is getting senior director level attention at both FG and Bombardier.