Dad and son lose appeal; 10-year sentences not too long, say top judges.
Jason David Cashman, 42, of Spennithorne Road, and Luke Peter Cashman, 23, of Mowbray Grove, Bishopsgarth, Stockton, carried out a revenge attack in the loos of The Keys public house in Yarm on April 24 2011, using a knuckle-duster and a glass.
Both were caged at Teesside Crown Court in April last year, having each been convicted of two counts of wounding with intent.
Luke Cashman, the son, was also found guilty of having an offensive weapon and breaching an Asbo.
Lawyers for the pair asked Lord Justice Leveson - better known as the phone hacking inquiry judge - Mr Justice Nicol and Judge Anthony Stokes QC, sitting at London's Criminal Appeal Court, to reduce those sentences, arguing they were unfairly harsh.
The court heard Luke Cashman, who had come to the pub armed with a knuckle-duster and was "intoxicated", went into the toilet when he spotted a man going in who had given evidence against him four years earlier. "Knowing that his son was to attack the man, his father went to assist him," the appeal judge said.
Once inside the lavatory, the revenge attack took place, with Cashman junior inflicting a beating using the knuckle duster, leaving his victim nursing cuts to the head.
At this point, said the judge, an "entirely innocent bystander" came to the assistance of the victim, and was in his turn attacked by the pair.
Jason Cashman used a glass he was holding as a weapon in this second attack, the judge said, and the victim sustained an injury to his ear which has left him with lasting tinnitus.
Lawyers for the father argued that the starting point for his sentence had been set too high by the Crown court judge. On the son's behalf, it was said his youth and the fact it was his first custodial term ought to have led to a reduction.
But Lord Justice Leveson, refusing each man's application, criticised the pair's "lack of victim empathy", adding that they "continued to deny the offences."
In relation to the father, the judge said he had "gone along with his son's attack when he should have discouraged him from doing it."
"This was a serious and sustained assault. There was the use of a weapon - in the father's case a glass and in the son's case a knuckle duster - and there were two offences, not just one.
"The son took a leading role, wishing to exercise revenge on the person giving evidence against him," Lord Justice Leveson concluded.
VIOLENT ATTACK: Our story last April when the pair were jailed
FACING LONG STRETCH: Jason Cashman, above left, and his son Luke Cashman, above right, who unsuccessfully appealed against their 10-year sentences