In a Commons motion they said coverage given to Fathers4Justice, which claimed responsibility for the attack, "rewarded" them for their actions.
BBC: NEWS | UK | Politics | Man fined over PM flour-bombing
2.
Pro-hunt protesters stormed the Commons chamber in the same year, while campaigners from Fathers4Justice threw purple powder at Tony Blair during prime minister's question time.
BBC: Parliament rooftop protest ends
3.
Last week two Fathers4Justice members held a rooftop protest at York Minster and 12 protesters disrupted a service of the Church of England's General Synod.