At a rough guess:
- No, because ultimately, while you can restructure the department & it's procurement structures & re/better negotiate contracts with industry, a lot of really expensive decisions, like delaying Trident replacement, delaying the carriers, slow-rolling Type 26... https://twitter.com/helenwarrell/status/1329367262705430591

construction & so on, are ultimately political & related to the importance placed upon them by the elected government of the day. Without the political will to either call a halt to the latest spec adjustment from the department, or to ultimately take the decision to go ahead now

quite simply, bad decisions will continue to be made
- Some, but not a spectacular amount, hence...
- Potentially some things (it does rather depend on what new tech is wanted & its cost), but ultimately - hopefully - rather less than if there had been the expected financial cuts