A “violent and difficult” man who knocked out an award-winning police officer's teeth before spitting on him and leaving him unconscious for five minutes in a pool of blood, has been jailed for 14 months.

Aiden George – whose brother Kieren was convicted of a murder in High Wycombe five years ago - was stopped by the police officer for riding a friend's motorcycle uninsured on September 16 this year.

Out of the blue, the 20-year-old lashed out at police constable Andy Smith – who was present in court for the sentencing - knocking him to the floor with one punch as he stood on Spearing Road in High Wycombe, Aylesbury Crown Court heard today.

Philip Levy, prosecuting, said: "PC Smith's head hit the pavement and he suffered some damage to the back of his head. More significant was the damage to his teeth which were knocked out.

"He had to have seven stitches on the inside and outside of his lips, and still has an unsightly mark around his lips which will hopefully disappear."

PC Smith had to stay off work for two weeks and was put on light duties indoors after his return.

Mr Levy added: "Following the attack, the defendant ran off, then came back twice, spitting on the prostrate officer as he went past.

"Various members of the public rushed to the officer's aid to assist."

PC Smith, who was named Community Police Officer of the Year in July, was described by colleagues as an "absolute credit to Thames Valley Police."

Helen Warren, defending George, said her client had lost his temper and should be given a full diagnostic assessment as she believed he was on the autistic spectrum and a sufferer of ADHD.

"Mr George panicked when the police officer came to take the bike away because it was not his bike, it was a friend's," said Ms Warren.

"The assault was not something he planned to do and he feels immediate remorse for it and has tried to apologise since then.

"He has been worried about PC Smith and has said he is pleased the officer has been able to return to work."

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PC Andy Smith.

George, who has a catalogue of previous offending including various batteries, assaults, and resisting arrest, admitted wounding without intent at the end of last month.

Passing sentence, Judge Francis Sheridan described George as violent and difficult, but said he accepted findings of experts that say he has ADHD.

He added: “All he [PC Smith] did was come up to you because you were not in lawful possession of that bike and he wanted to make inquiries and remove it from you.

"What did you do? You punched him so hard he fell back and hit his head on the pavement.

"I am not blaming the pavement for his injuries. I am blaming you.

"The officer was unconscious for five minutes. You don't have to be a medical expert to know that it is dangerous for somebody to be unconscious for that length of time.”

He added that he was recommending to the High Sheriff that members of the public who helped PC Smith are commended for their efforts.

George, of Spearing Road, was jailed for 14 months and ordered to pay £900 costs and a £100 victim surcharge.

Deputy LPA commander for High Wycombe, chief inspector Rebecca Mears, said: “We were all shocked by the serious assault on PC Smith and I am satisfied that the person responsible is now facing a prison sentence.

“It is always difficult when a member of the police family is injured and many of us know PC Smith personally.

"Fortunately, assaults on police officers are rare, but this does serve to remind us all how dangerous and unpredictable policing can be."

She added: “The response from the public and the number of witnesses who came forward highlighted the recognition that police officers are part of the community. On behalf of all the High Wycombe police officers, I would like to express our gratitude for this support.”