A company director smashed into a family car and threatened to slap a mother-of-three after an alcohol-fuelled lunch and golf outing at Gleneagles Hotel.

Caravan dealer Christopher Dickson left the children screaming after writing off the  car and then violently confronting their parents during the road rage incident.

Dickson then left the scene and downed a glass of wine in front of police officers when they arrived at his home to give him a breath test.

Dickson, who told his victims he had been drinking all day, was found guilty of a series of charges after a trial at Perth Sheriff Court on Friday.

The 29-year-old, who is a director of family firm Dicksons of Perth, was banned from driving on an interim basis and had sentence deferred for reports by sheriff Gillian Wade.

Witnesses Alexander and Julia Nicoll said Dickson had driven his £40,000 Mercedes aggressively for a few streets in Perth before the incident that wrote off their Ford Galaxy.

The couple told the court that as they turned right from Marshall Place on to Edinburgh Road, Dickson cut in front of them before slamming on his brakes, causing them to run into the back of his C-class estate.

They said Dickson got out of his car and was banging their windows and swearing as their three children cowered in the back seats.

Mrs Nicoll said Dickson smelled of alcohol and bragged he had been on a day-long binge drinking session before telling her he would give her a slap.

Constable Martin Buchan said they had traced him to his home but had to wait 20 minutes to perform an accurate breath test.

Mr Buchan told the court: "He said that since he arrived home he had consumed a quantity of alcohol. He had had two tins of lager and a glass or so of wine.

"There was a glass of wine sitting where he had been watching the telly.

"As we waited he became a bit restless about us being there and the accusations, and he drank the rest of the glass, which was unfortunately on the table in front of him.

"When he picked up the glass we said 'don't do that' but it was too late."

Dickson, of Croft Park, Perth, admitted during evidence that he told Mrs Nicoll he would slap her but claimed he was entitled to because there was a confrontation with the couple.

Sheriff Wade found him guilty of drink-driving in Perth on February 28.

He was also found guilty of careless driving by causing a crash and behaving in a threatening manner by shouting, swearing and uttering threats of violence.

The sheriff noted that Dickson - who had been at his brother's funeral two days before the incident - had a previous drink-driving conviction from 2008 and deferred sentence for reports.