(11 Jul 2020, 10:07 am)Andreos1 wrote There was a raft of funding available from central government, the conditions attached to it meant that the day to day running had to be franchised out. 
DB got it for a couple of years, Nexus got the funding and then the contract ran out. 

That's essentially it. 

I don't think Nexus wanted to do it that way and got out as soon as they could - after getting the funding.