Personally I think that the Carriers will be canned & with it JSF. The Harriers will be kept & the CVS will be refitted again (to keep the RN happy and some jobs for Babcock at Rosyth); Maybe fit them and the T45 with Tomahawk after all to give some strike capability. Tornado will go early & some Typhoon will be re-roled for a strike/ CAS function. The Army will lose AS90 and MLRS but keep the same number of infantry regiments. Allocate the AWACS aircraft to the NATO pool (& put several airframes in storage?).
Trident - Hmmm, tricky one for the politicos, but if it were me I would try to make political capital out of retiring it - disarmement etc. After all, we have always looked two faced trying to argue with Pakistan, Iran etc that they shouldn't have N weapons but its OK for us to have them.