OP – firstly, there is still a war in Afghanistan. About 5,000 are preparing to go; 5,500 are deployed; 6,000 are recovering and picking up their lives; 20,000 are in basic, advanced & trade training; 600 are peacekeeping in Cyprus; a unspecified number in the Falklands; about 800 in Brunei… The remainder are training in order to provide a credible deterrent against future threats. The only certainty is uncertainty; the only preparation is adaptability.
The Army only acts in civil emergencies when asked to do so by the local authorities. In fact, most civilian agencies and blue light services are are much better placed to help in civil emergencies than the Armed Forces, apart from specific niche skills eg. Bomb disposal, amphibious vehicles, and mass aviation.
A private soldier today is better trained, equipped and educated than a SAS Trooper in the Falklands War, but they will happily fill sand bags and help the public when asked to do so.