An LSD-fuelled bender during last year’s student protests landed Charlie Gilmour with a 16-month sentence for violent disorder.

Charlie’s lawyer, Robert Brown, said: “Today, 15 November, Charlie Gilmour was released from HMP Wayland subject to him complying with a home detention curfew.

“The curfew will continue until the halfway point of his 16-month sentence. This is standard procedure for prisoners who are serving a sentence of between three months and four years.”

Brown added that the 21-year-old’s early release from Wayland prison in Norfolk was not special treatment but normal procedure.

Charlie, who was jailed in July, protested against rising university fees last December among thousands of others.

He was photographed hanging from a Union flag on the Cenotaph war memorial and was seen jumping onto the bonnet of a Jaguar car when a group of protesters attacked a convoy carrying Prince Charles and his wife, Camilla.

Charlie’s mother, novelist Polly Samson, spoke out about his time in prison and complained that he had been locked up for 23 hours a day.

Cambridge University has not yet made a decision on whether Charlie will be allowed back to finish his history degree.