Jungly,
I don't think the RAF Airships would be foolish enough to try that as cancellation of JSF would also affect them adversely.
The Labour Gov't has too many votes riding on this one and the Tories (if they get elected) Still have enough Military-minded MP's who still remember what happened in the Falklands. I have a feeling there might be a bit of inter party one-upmanship going on. ie who can procurre the best carrier for the RN, as both parties seem to have pretty much the same foriegn policies which as we all know is the main deciding factor on how are forces are organised and equiped (NOT)