"This investment will support an increase in our reserve forces to a trained strength in the Army Reserve of 30, 000, the Maritime Reserve of 3, 100 and the Royal Auxiliary Air Force of 1, 800, all by 2018, " said Mr Hammond.

BBC: Army reservists overhaul outlined by Philip Hammond

Auctioneer Jonathan Humbert said the bus, which can hold 35 passengers, has just 28, 000km (17, 398 miles) on the clock and it has its own auxiliary generator and air supply in case anyone attacked it.

BBC: Margaret Thatcher's "Battle Bus"

Air-quality management with measures to reduce emissions from aircraft, vehicles, auxiliary power units (APUs) and ground power units (GPU).

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The ES is critical to aircraft operation it distributes power around the aircraft from the engines and the Auxiliary Power Unit (APU) which provides the power to operate the air conditioning and to start the engines at the gate to all the systems requiring electricity.

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