Probably the cheapest and best option is to build more wind and not care too much if it increases curtailment.
Yes, all the things mentioned should be looked into and done when it makes financial sense but "wasting wind" is much less a thing to worry about than "burning gas", and I'd rather waste wind than waste money.
Maybe not: "The Transport Secretary announced on 19 October 2022 that the Transport Bill which would have set up GBR would not go ahead in the current parliamentary session."
the franchising sysem won't be coming back
TPE is still under covid arrangements and Avanti West Coast is under a new style management contract as I described above
switching out top level boss doesn't suddenly improve underlying problems with the service
in the UK this is almost always the infrastructure, which has been nationalised since 2002
the government (DfT) had more control over the railways under the franchising system than they had when BR existed
almost all of what the hated "train companies" consists of is putting a driver in the cab, the rest is down to the DfT