A rich "nit-picking" businessman told by a judge to find £500 (€560) to help pay for his teenage son's kayak during a long-running divorce court battle with a former partner has complained that the boat was over-priced.

Mr Justice Mostyn made a ruling in May after the woman asked for around £20,000 (€22,400) to cover "modest capital provision" for their son at a family court hearing in London.

She wanted £15,000 to replace her car, £4,500 to cover the cost of foreign trips the boy was due to take, £600 for a new laptop plus £500 to cover some of the cost of a kayak.

The judge said the woman, who earned £500 a month working part time, had made a "manifestly" reasonable claim and he ordered the man to hand over the £20,000 asked for.

He said the man had "millions" and had a ''nit-picking and controlling approach''.

But the man has complained that he was asked to pay too much.

His lawyer wrote to the judge saying "internet" research had established that the true cost of a kayak was no more than £500.

He also complained about the cost of one foreign trip and said the boy had changed his mind about going on another.

Mr Justice Mostyn has revealed the man's complaints in a second written ruling on the case.

The judge dismissed the kayak complaint and the complaint about the cost of one foreign trip.

But he said the woman should return about £3,000 handed over to pay for the trip the boy had decided not to take.