John Baker, 44, left the facility of HMP Springhill, an open prison near Grendon Underwood, without permission.

The incident took place at about 7pm on Saturday, May 23.

He is 5ft 9ins tall, of medium build, and has links to Northwood, near Watford.

Detective sergeant Jon Muldoon said: “We are appealing for the help of the public to trace John Baker, who is unlawfully at large after escaping from HMP Springhill.

“If you see Baker, do not approach him and call 999 instead.”

Police are appealing to help find Cody, who was last spoken to at close to midnight on Saturday, may 23.

A police spokesman said: “We’re asking for your help to find a missing boy, Cody.

“He is 16 years old and was last seen yesterday at Didcot train station around 3.45pm and he was last spoken to around 11.30pm last night.

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“He is described as white with a slim build, around 5ft 5ins tall. He was last wearing black trousers with a grey patch on the side, a white t-shirt, a black hooded jacket and black trainers.

“He is known to travel to the Oxford and Reading areas 📍

“Cody if you see this, please can you let us know where you are.

“If you have any information about his whereabouts, please call us on 999 quoting reference number 43260257230.”

The Hawkstone Farmers’ Choir sailed into next week’s live final of BGT during the Saturday’s show.

Originally founded by Jeremy Clarkson to advertise his Cotswolds-based alcohol brand, the group is a collective of real British farmers.

Among them is James Florey, a fourth-generation farmer from Witney who supplies beef and lamb to Mr Clarkson’s The Farmer’s Dog pub in Asthall, near Burford.

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During Saturday’s live semi-final, Mr Cowell – who lives near to Mr Clarkson’s 1,000 acre Diddly Squat farm in Chipping Norton – took a joke swipe at his friend.

Praising the choir, Mr Cowell said: “I love what you stand for. It might be a bit annoying to see Jeremy Clarkson’s smug face is the only downside. Well done.”

The results were also live broadcast at Farm Fest, held in Warwickshire this weekend and fronted by the Clarkson’s Farm team.

After 14 weeks of auditions and live semi-finals, the remaining 10 finalists will go head-to-head one final time in the hope of impressing the judges – Simon Cowell, Amanda Holden, KSI, and Alesha Dixon – and the public.

Viewers will be able to vote for who they’d like to win the BGT final on the ITV website.

People are limited to five votes per registered mobile number per voting window.

Mr Clarkson has urged people to vote for the Hawkstone Farmers’ Choir, who won the golden buzzer during their audition from Amanda Holden.