 Mason was convicted of assault and assault with intent to resist arrest in March 1990 and sentenced to 180 hours community service.This was followed by a three-month jail sentence suspended for 12 months for actual bodily harm and, in August 1993, by three years' probation for assault causing actual bodily harm.On 14 April 2003, Mason and two friends Mark and Simon Gibson, were found guilty of aggravated burglary with intent to cause grievous bodily harm.