"our commitment for the next 15 years"
You talk as if 15 yrs is a long time.
The lead time on things like carriers is longer than that, and we must look to the future.
Carriers are useful for a long time. Some of our last real carriers are still in service with other nations after 50.
As to your other points:-
"Chinook.....not stopped since mid 90's
Tornado GR4...about to deploy to the Stan
Tristar....going like the clappers just trying to keep up
VC10....knackered but still stagging on
more than happy to add them to the list, with your accurate desriptions of their state. It all bolsters my argument that the RAF is in a bad way, and the FAA is a better bet.