One of its activists at the weekend climbed the London Eye, the jumbo ferris wheel on the banks on the River Thames, dressed as Spiderman, unfurling a banner declaring "In the name of the father".

In May, two members of Fathers 4 Justice burst into the House of Commons and hurled a condom full of purple flour at Prime Minister Tony Blair during a question and answer session.

The incident forced all the deputies to evacuate the building for an hour before it was deemed safe to return.

Founded in December 2002, Fathers 4 Justice is fighting for the rights of fathers and grandfathers to see their children following a divorce or separation.

It promotes non-violent actions with a sense of humor, much like the environmental group Greenpeace, it said on its website.

"All children, their parents and grandparents have inalienable rights to enjoy a meaningful, loving relationship with each other woven into our social fabric for over 6,000 years," the group said.

"Parliament's express intention in the 1989 Children's Act was exactly this yet the child's best interest principle has now effectively become the mother's best interest," it said.

A man supported by the organization grabbed headlines in November 2003 when, dressed as the comic book hero Spiderman, he spent six days perched on a crane near the Tower of London.

A month later, a man dressed up as Father Christmas -- or Santa Claus -- fought for the rights of the divorced when he caused a massive traffic jam on one of the main highways into London.

Disguised as Batman and Robin, two activists reached the roofs of the Royal Courts of Justice in October last year.

During a protest to "defend" Father Christmas in 2002, 200 activists dressed in red and wearing long white beards occupied the department of constitutional affairs.

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