A Fathers 4 Justice activist involved in a flour attack on Tony Blair has been convicted of disorderly behaviour.
Protester Ron Davis got a ticket into the Commons at a charity auction
Ron Davis, 48, of Worthing, Sussex, was given a two-year conditional discharge and fined £500 at Bow Street Magistrates' Court on Wednesday.
The prime minister was hit by packages of flour while speaking in the House of Commons in May.
Mr Davis's accomplice Guy Harrison, 36, of Ashurst, Sussex, was earlier fined £600.
He admitted to the same offence at Bow Street Magistrates Court in May.
Mr Blair was replying to questions from Tory leader Michael Howard when he was hit on the back by one of the packages thrown from a gallery above him.
MPs were evacuated from the chamber.
Campaign group Fathers 4 Justice claimed responsibility.
The incident happened despite a £600,000 bullet-proof security screen being installed in the chamber at Easter.
It prompted a wide-ranging review of security, led by MI5.
Labour peer Baroness Golding said the two accused were guests of hers and she offered "unreserved apologies" to Commons Speaker Michael Martin, MPs and fellow peers.
She said the men had got tickets to the Commons at a charity auction.