Pro-hunting campaigner Otis Ferry is facing being disqualified from the roads after admitting drink driving.
The 23-year-old son of rock star Bryan Ferry changed his plea halfway through his trial at Stroud magistrates' court, Gloucestershire yesterday.
Ferry, who appeared under full name Charles Frederick Otis Ferry, admitted having 55 micrograms of alcohol in 100ml of blood - 20 micro-grams above the legal limit - when stopped by police in Cirencester, Gloucestershire, in October.
The courts heard Ferry, of Keepers Cottage, Eaton Masc ott, near Shrewsbury, Shropshire, admitted drinking that evening but did not think he consumed enough to take him over the limit.
His barrister, Phillip Lucas, said: "The issue is his genuine belief he hadn't consumed enough alcohol to put him over the limit. That has been his belief and remains his belief.
"Having heard the evidence he is satisfied the correct procedure was followed and the Crown has proved his case and there has been a change of plea."
Magistrates adjourned sentencing so Ferry's lawyers could hire an expert to explain how his alcohol level had gone over the limit.
Mr Lucas said: "If the defendant is right - and he genuinely believes he had consumed less than he did - then that will be a special reason for not disqualifying him."
Ferry, son of Roxy Music frontman Bryan, was granted unconditional bail and will be sentenced on October 16 at Gloucester Magistrates' Court.
Mr Lucas said he wanted to get information about a special offer at a bar where Ferry spent the night to find out how much alcohol he was served.
He said: "I believe there was some sort of offer where if you bought a drink you were given something larger free."
Ferry, who appeared in blue trousers and a tweed jacket, was pulled over by police suspicious of his slow driving.
Pc Nigel Bates said he was suspicious because the vehicle was leaving a car park near Cirencester's The Rock nightclub.
The constable said he decided to stop Ferry's Volkswagen Golf because of the "manner of the driving of the vehicle at that time of night and seeing it in the vicinity of a nightclub".
He added: "It was travelling at 20 miles an hour in a 30 miles per hour zone, which is not an offence but at that time of night on a straight section of road it got me concerned the driver may have been drinking or unwell."
The officer said he pulled Ferry over and he subsequently failed a breath test.
He was arrested and taken to Stroud police station for a formal breath sample.
Pc Bates said Ferry "had a strong smell of intoxicating liquor and his eyes were reddened". The officer added: "He had been drinking, but I would not say he was drunk."
