Second Fathers 4 Justice roof-top protest at Harriet Harman's house in a month

This is the second time in little more than a month that the group has targeted the Cabinet minister’s South London home.

Protesters Nigel Ace, 40, who wore a Spiderman costume, and Tony Ashby, 42, who dressed as Batman draped flag on her wall saying ‘Stop the war on dads’.

Surprise: Fathers 4 Justice campaigners on the Cabinet minister's roof

Miss Harman ignored the pair after leaving her home at 7.44am – more than an hour after raising the alarm.

It is the second time the property in Herne Hill has been invaded.

On June 8, Jolly Stanesby and Mark Harris invaded her roof to highlight the fact that the Government is making fathers redundant.

Mr Stanesby spent more than 24 hours on the Cabinet minister’s roof in a protest that began on June 8 and ended the next day.

The pair were bailed by police until July 16 pending further police inquiries.

Blustery: Tony Ashby as Batman and Nigel Ace as Spiderman hang on to their brolly

The group said at the time it wanted to highlight the fact that fathers were being made redundant emotionally in the courts, and now biologically in the new Human Fertilisation and Embryology Bill.

Last month’s protest forced Ms Harman, Minister for Women and Equality, out of her home.

Today’s protesters, dressed in the now-familiar superhero costumes used by the Fathers 4 Justice group, said they would not come down until the Government takes them seriously.

Mr Ace and Mr Ashby said they had enough food supplies to last for a week.

Shiver: The pair wrap up warm as the weather gets worse

Mr Ace, who described himself as a sales manager from Bristol, said the stunt was provoked by Ms Harman’s recent pledge to ensure equality in the workforce.

He said: ‘What about dads? We haven’t got equality. The Government is ignoring us and has a feminist agenda.

‘We want Harriet Harman to come back here and engage in a debate with us and if not then Gordon Brown should come. I am trained in survival, so I don’t care how long we are up here.’

Mr Ashby, who described himself as a painter and decorator from Leicester, said he had not seen his children for seven years.

He said: ‘We have been up here since 6am and we are in for the long haul. We don’t want to cause trouble, we just want to get our message across.’

Furious: Harriet Harman outside her home the last time it was invaded in June

The men said they had not been involved in any previous stunts and had drawn straws to decide who would stage today’s protest.