Speaking outside the court martial, Sergeant Danny Nightingale has apologised to taxpayers for footing his ongoing legal battles.
He said that his own part in covering legal bills had been "financially debilitating".
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.