There is only one service whose work can be undertaken by the other two:
Why not disband AAC as the RAF can fly Helicopters, Disnband ARMY,as it is not Royal, and replace it with an enlarged RAF Regiment, and as 1 Sqn have plent of Carrier experience, give the Carriers and FAA to the RAF and as for the rest of the little ships, well, a lot of people sail boats at weekends, I am sure the RAF can find a few who need little training, so there goes the Army and Navy.
Royal Marines would have to stay, as they would kick ***** out of the Rock Apes if they went anywhere near a them.
Better still, contract the all services out to the private sector, and see if they all go on strike when JPA doesn't pay the contract.
Time to vote out Blair and Co, and time to spend all our 3rd world debt cancellation charges and other 'useful' donations to far off corrupt countries on all defence forces of the UK.
Days to do are getting Few.