But defiant Laurence Wilson, 62, said: "I've been the victim of a miscarriage of justice."
Wilson told police James Ramsden was at the wheel when his car was clocked doing 63mph in a 50mph zone in Hutton, near Preston.
When a camera photo showed only one person was in the car, Wilson continued to blame Mr Ramsden.
But magistrates convicted him of failing to supply information to the police.
He was fined £350, told to pay £400 costs and given three points on his licence.
Wilson, of Greenfield Drive, Lostock Hall, appealed against the conviction, claiming he now believed his former boss, Stewart Foster, owner of the Fulwood-based North Western Driving Training Centre, had been behind the wheel at the time of the offence.
But Mr Foster told Preston Crown Court it could not have been him because he was visiting family in the North East on the day in question.
Judge Anthony Russell QC rejected Wilson's appeal and ordered him to pay a further £355 in costs.
Mr Wilson told the Lancashire Evening Post: "I wanted to turn this decision around and I feel hard done by.
"In all the previous hearings I didn't feel the case was heard properly.
"There has been a miscarriage of justice done here."
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