Andrew Pennington, an assistant to Liberal Democrat Cheltenham MP Nigel Jones, was fatally wounded in the attack at the constituency office last January.
Mr Jones, who still suffers flashbacks from the attack, said Mr Pennington was 'the bravest man he had ever known . . . he saved my life'.
The MP, who himself suffered severe cuts to his hands after grabbing the
The Queen took a personal interest in the case and discussed Mr Pennington's actions with the MP at a social event at Buckingham Palace.
The attacker, Robert Ashman, was a regular visitor to the constituency office and was being helped by the MP in various legal disputes. On the day of the attack he was talking to the MP before drawing the samurai sword from his coat.
Mr Pennington told the MP to escape before attempting to restrain the attacker. He died of his wounds shortly afterwards.
Mr Ashman was later sent to a secure psychiatric unit for an indefinite time after a jury decided he was unfit to stand trial.