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A soapbox cart decorated by a Fathers 4 Justice splinter group has allegedly been disqualified from entering Sunday's Red Bull Soapbox Race on grounds of being "too political".

New Fathers 4 Justice, the Somerset group whose members scaled Westminster Abbey on Father's Day, said its blue cart - to be driven by a man dressed as Harriet Harman - would not be involved in the 62-team downhill race.

"We were originally told the race was oversubscribed," the group said in a statement, "but after a phone call to the organisers offering to compete at the last minute if anyone pulled out we were told our entry is too political."

The "men to men" cart - a reference to the interim Labour leader's "woman to woman" campaign bus, seen out and about before May's election - was to have the words "vote dad" written on each side.

Spokesman Pete Moore said he was "obviously disappointed" and pledged to "take action on the day" if he deemed any other carts in the race to have "politlcal overtones".

He did not specify what this action would be.

New Fathers 4 Justice campaigns against what it claims is a bias against men in the family courts system.

The soapbox race website reads: "Previous designs have included a piano, a giant baby carriage, a rodeo clown, a massive corn on the cob, a jail cell and the Golden Gate Bridge."

Mr Moore added the controversial campaign group would be supporting Batman-inspired team You Gotham Be Kidding Me in the race.

Red Bull has been approached for comment.