Prince Harry climbed into the cockpit of a Spitfire and started the engine during a visit to the Boultbee Flight Academy in West Sussex this afternoon.
He was there to lend his support to the launch of a flight scholarship for injured ex-servicemen.
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The Chancellor will promise to fix a glitch, which means repayments continue to be taken for up to 12 months after the loan is paid off.
The proposal will see the introduction of a discounted railcard for 26-30-year-olds, as the government looks to lessen the cost of living.
The vessel went missing last week with 44 sailors on board.