Two men were charged with threatening behaviour yesterday in connection with the flour-throwing incident during Prime Minister's Questions on Wednesday.
Ron Davis, 48, and Guy Harrison, 36, were charged under section five of the Public Order Act for using threatening or insulting words or behaviour, or disorderly behaviour, likely to cause harassment, alarm or distress.
Both were released on bail pending an appearance next Wednesday at Bow Street magistrates' court.
At a press conference yesterday afternoon in a bar in Shoreditch, east London, they launched a bitter attack on the family law system, claiming that the failure of the courts to enforce access orders allowing fathers to see their children was a form of "child abuse".
The men are members of Fathers 4 Justice, a group campaigning for better access rights to their children.
They described the moments leading up to the alleged attack, which resulted in Tony Blair being hit by a condom filled with purple flour, and said they regretted causing so much "worry".
The press conference was marred by a scuffle when a man tried to serve a legal document on Mr Davis. He was wrestled from the bar by a number of supporters from Fathers 4 Justice, including David Chick, 37, the man whose crane-top protest in London last year caused disruption estimated at £50 million.
Around a dozen police officers later arrived to break up the gathering at the bar.
Outlining their motivation for the incident in the House of Commons, Mr Davis, from Worthing, West Sussex, said: "It was never our intention to frighten anybody in the public or in the House. It was to draw attention to the evil family court system and the damage it is doing to our children, parents and grandparents in this country and to make this change happen.
"It's absolute child abuse to prevent a good parent from seeing their child and to try to turn that child away from that parent."
Mr Harrison, a businessman from Ashurst, West Sussex, described the moments before the incident in the Commons. "They were discussing Iraq and we waited for Mr Blair and Michael Howard to stop speaking because we knew it wasn't appropriate to the people in Iraq," he said.
"We waited for a time when they were joking about how the Government had done. That was when Ron stood up with a 'Justice 4 Children' banner and I threw flour with purple colouring."
The pair had gained access to the chamber by winning a charity auction involving the Labour peer Lady Golding, a lifelong campaigner for the rights of children and families.
"Lady Golding knew nothing about what was happening. She is a fine lady," said Mr Davis.
Matt O'Connor, the chairman of Fathers 4 Justice, said there would be more stunts before Father's Day next month. "We have something really mega lined up, which is guaranteed to drag more sections of society into the debate," he said.
"I am really angry that every day we have to Hoover up the wreckage of broken people with broken lives," he added.
Graham Mansen, 38, one of the group's London co-ordinators, who once held up traffic on the A13 while dressed as Batman, said yesterday that at least two more events would take place in London.