The fathers' rights campaigner who carried out a flour bomb attack on Tony Blair has condemned a plot to kidnap the Prime Minister's son.

Ron Davis, from Findon near Worthing, spoke yesterday before Fathers 4 Justice announced it was to disband in the wake of the furore over the alleged plot.

Mr Davis hit the headlines in 2004 when he and Guy Harrison, from Steyning, threw three condoms filled with purple flour over Mr Blair in the House of Commons.

The stunt was to raise awareness of the group's view that fathers are unfairly treated by family courts.

But the kidnap plan, reported by The Sun newspaper yesterday to have been planned by a group of extremists on the periphery of Fathers 4 Justice, provoked widespread condemnation.

Mr Davis, who has not seen his 15-year-old daughter and 12-year-old son in seven years, said the plot to abduct five-year-old Leo was "horrendous".

Later last night, the group's leader Matt O'Connor told Channel 4 News the group could not continue in light of such negative publicity. He said: "I regret to say that three years after starting the organisation, we're going to cease and bring it to a close."

However, Terence Bates, of splinter group Real Fathers 4 Justice, insisted they would continue to campaign. He said Mr O'Connor should have wound up his arm of the group a year ago when it split.

Asked whether the campaign had failed because it had not brought about any changes in family law, Mr Bates said: "Mr O'Connor has failed. He failed to move it forward. Many many good people left last year and formed our splinter group."

Mr Davis, 49, of Vale Avenue, was unavailable to comment on reports the group was to disband. But earlier yesterday he distanced his campaign from the alleged kidnap plot and said: "They are nothing to do with us and we absolutely condemn it.

"We are about reuniting parents. The thought of taking children away and the distress that would cause the children is just unthinkable."

Special branch officers uncovered the plot as they investigated ex-members of Fathers 4 Justice expelled from the organisation for extremist behaviour.

In the past, demonstrators have dressed as superheroes and scaled St Paul's Cathedral, the London Eye and Buckingham Palace. Last September, Mr Harrison, 38, spent five hours on top of the Houses of Parliament waving a banner.

Mr Davis denied the flour bombing paved the way for more extremist action.

He said: "There are many things we could have done which would have been worse. We played a schoolboy prank and threw a flour bomb at Tony Blair."

Mr Davis also suggested like-minded campaigners could "form a different group to get away from the bad publicity".