Fathers 4 Justice have had a number of high-profile protests

John Brown, of Newbury, Berkshire, says he has survived on just two glasses of wine and soya milk for eight weeks in protest at a demand for �22,000.

He is to begin a water-only fast if officials do not back down at a meeting organised by his MP David Rendel.

The 56-year-old has not seen his 17-year-old daughter for four years.

The fight with the CSA has left me utterly destroyed John Brown, Fathers 4 Justice

Mr Brown, a former advertising photographer, split from his partner in 1996.

But he says the CSA has massively overestimated his income with its demand for seven years' of child support payments.

Mr Brown told BBC News Online: "I haven't been able to work at all because of what is going on.

"The fight with the CSA has left me utterly destroyed, because it is almost impossible to pick up the strings of a formerly successful career.

"I want my hunger strike to send out the message that the judicial system surrounding children is destructive rather than constructive."

Mike Ellis, a local Fathers 4 Justice organiser, told BBC News Online: "While we don't encourage drastic acts, we can't let one of our members down by ignoring them in a difficult situation."

Mr Ellis was accompanying Mr Brown to the meeting, organised by Newbury MP David Rendel at his constituency office on Friday at 1400 BST.

On Monday Fathers 4 Justice campaigner Jason Hatch scaled the balcony at Buckingham Palace, dressed as Batman.

Mr Hatch, from Cheltenham, Gloucestershire, was arrested with a fellow member and must answer bail in December.

A spokeswoman from the CSA said: "I am afraid I cannot comment on individual cases."