A MUM whose 'life has changed forever' after her 16-year-old son was knocked off his bike in a car crash last week has thanked the passing heroes who cared for him.

Serina Ashton posted her heartfelt thanks online after her son and his best friend were involved in the crash on the A41 Oxford Road, in Bicester, on Friday.

The teenagers were on their bikes when the crash happened about 7am on the busy road near Tesco.

South Central Ambulance Service said one of the boys had suffered a 'serious' head injury and was taken to the John Radcliffe Hospital in Oxford.

The following day Ms Ashton took to the Bicester and Surrounding Villages Chat Facebook page in a bid to find the people who helped her son who was left 'fighting for his life'.

In particular she hoped to track down a passing doctor who she said saved his life and a passing nurse who had been on her way to breakfast.

She said: "I am not looking for sympathy and certainly not looking for finger pointing and blame.

"This has changed our lives forever. My son and his best friend were involved in the car vs bike accident yesterday morning.

"I am eternally grateful that the doctor that luckily was at the scene when it happened saved my son's life and gave him enough time to reach the hospital.

"I was also only able to get to the scene quickly as his mate, who also sustained a head injury, came to get me, such an selfless act."

She added: "Also an nurse that happened to be getting breakfast but stopped to help also, thank you."

The Good Samaritans looked after both boys until the Thames Valley Air Ambulance helicopter arrived, along with two road ambulances, some minutes later.

The road was closed until gone 9am while the boys were treated and then Ms Ashton's son taken to hospital.

Ambulance service spokesman David Gallagher said: "The cyclists were both 16-year-old males; one sustained a serious head injury and after initial treatment at the scene was taken to the John Radcliffe Hospital.

"The second patient sustained a minor head injury and after assessment was happy to be left in the care of a family member at the scene."

Ms Ashton's post said the next day that her son was 'fighting for his life' adding: "We have an long journey of uncertainty ahead.

"I really feel for the driver deeply, I want you to know I am also thinking of you at this time as it must of been horrific for you also."

Thames Valley Police is appealing for anyone who witnessed the crash, or anyone that might have dashcam footage from around 7am.

Anyone with details can call police on 101 referencing 249 3/8/18