Mike Ferguson was taking an organ for transplant

Mike Ferguson, from Bradford, was taking a liver from Leeds to Cambridge for an emergency transplant when he was allegedly clocked at 104mph.

Ambulance drivers are permitted to drive over the speed limit in times of medical emergency.

But lawyers for the Crown Prosecution Service believe the law must be tested in court, and claim his trip did not constitute a medical emergency.

My concern is the terrible position it now puts every ambulance driver in the country in John Durkin, GMB branch secretary

Now the GMB union, which is representing Mr Ferguson has written to the Home Secretary David Blunkett, requesting that the case against him be dropped.

Mr Ferguson had been due to appear before magistrates in Grantham, on Wednesday, but the case was adjourned at the request of the defence until 11 June.

Union branch secretary, John Durkin, said: "My concern is the terrible position it now puts every ambulance driver in the country in.

"We would like clear clarification now so that people who are out performing life-saving journeys are not put in a position as to whether their jobs are going to be lost if they go that extra mile trying to preserve life."

Repeated offence

Mr Ferguson admitted to repeating the offence on the A1 at the weekend as he delivered another organ for transplant.

He said: "I did break the speed limit last Saturday morning, I admit that.

"But again it was a response I had to complete as someone was waiting for an organ."

Mr Ferguson, who had a 36-year unblemished driving record and is trained to drive to the same standard as the police, also thanked those who have supported his case.

He said: "The support I have had has been absolutely incredible.

"I don't know of anyone who has had a bad word to say."