The ringleader of a teenage gang who went on a rampage in Gerrards Cross and High Wycombe has been told by top judges he cannot complain about his sentence.

The 14-year-old, who cannot be named for legal reasons, was locked up for two years and eight months at Aylesbury Crown Court in July after admitting two robberies, assault by beating and possessing a knife.

The boy, from High Wycombe, today challenged his sentence at the Court of Appeal in London, with his lawyers arguing it was "too long" for someone of his age.

But his complaints were dismissed by three senior judges.

The court heard the boy and nine others teenagers - most wearing ski masks - started by robbing a 13-year-old boy in East Common, Gerrards Cross, at around 4.30pm, threatening him with a knife and knocking him to the ground - stamping on him for several minutes, before stealing his phone.

The attack was filmed by gang members and shared on social media. The gang, in "high spirits" after the attack, then travelled to High Wycombe by train.

They went into the Eden Shopping Centre and stole a watch from a 14-year-old after trying to take his backpack - which was again sold by the gang leader.

They also knocked a woman to the ground and assaulted an 18-year-old man.

The boy was said to have led the violence, as he took the knife to the common, used it to threaten the victim and sold on the stolen items.

His lawyers argued his sentence was too tough, saying the crown court judge didn't take enough account of how young and immature he was at the time.

But, rejecting his appeal, Mr Justice Langstaff said the judge did have regard to the boy's youth.

Sitting with Lady Justice Hallett and Mr Justice King, he added: "Far from showing remorse, he celebrated what he had done in the video.

"We do not think that the sentence for robbery could be said to be excessive, even for one so young."