An ambulance driver charged with speeding while delivering an organ for a life-saving transplant has presented a petition with more than 20,000 signatures to 10 Downing Street.

Mike Ferguson, of Birkenshaw, is due to appear in court next week after he was allegedly clocked driving at 104mph on a mercy dash to Addenbrooke's Hospital in Cambridge.

On the doorstep of Number 10 Mr Ferguson, 56, thanked the public for their support in signing the petition - which calls on the Government to clarify the law regarding the transportation of human organs. The senior driver with West Yorkshire Metropolitan Ambulance Service was delivering a liver to the hospital on January 16 when he was allegedly caught speeding on the A1 by Lincolnshire Police.

He entered a plea of not guilty to the charge through his lawyers at a hearing before Grantham magistrates in June this year, but the case was delayed for four months.

The ambulance driver, who has a 36-year unblemished record, said: "I was doing my job. I work in saving lives and as far as I am concerned that was what I was doing that particular night."

Mr Ferguson is not only calling for his own court case to be suspended but for a clarification in the law.

He added: "We would like Downing Street to say 'OK, enough is enough. The judicial process is suspended as far as you are concerned and we will review the law' so that no one has to go through what I have gone through in the last ten months."

Gary Baker, NHS lead officer of the GMB union which circulated the petition, said: "We have to make sure the ambulance services arrive on time. Michael was just doing his job, nothing more. He was not driving recklessly - he was going to deliver an organ to save someone's life."

Mr Baker said if Mr Ferguson was found guilty he could lose his job and the ruling would have an adverse effect on the human organ transportation programme.