WEBF - the loss of both those capabilities you mention has been covered in depth on this and other threads, but for the record the reasons were:
- Harrier - lack of cash, force became to small (due to previous cuts) to make it worthwhile retaining, plus a lack of cash!
- Nimrod - lack of cash, political unwillingness to progress with a tainted platform, lack of cash, technical difficulties some of which remained unresolved, plus a lack of cash!
There's really nothing more to say...