The son of Pink Floyd guitarist David Gilmour was jailed for 16 months today for going on a drink- and drug-fuelled rampage at a student fees protest.

Charlie Gilmour admitted violent disorder after joining thousands demonstrating in London's Trafalgar Square and Parliament Square last year.

During a day of riots he was seen hanging from a Union flag on the Cenotaph and leaping on to the bonnet of a Jaguar car that formed part of a royal convoy.

He was found today to have also hurled a rubbish bin at the vehicle.

The court heard the Cambridge University student had turned to drink and drugs after being rejected by his biological father, the writer Heathcote Williams, and had taken LSD and valium in the hours leading up to the violence.

Charlie Gilmour was pictured swinging from a Union Flag on the Cenotaph memorial during the march against tuition fee increases in December.

He pleaded guilty to violent disorder in May and appeared for sentencing at Kingston Crown Court in south west London accompanied by his rock star father and mother Polly Samson.

The court was shown CCTV footage of him in Parliament Square waving a plastic bag containing food and was heard to shout: “Let them eat cake”, the court heard.

He added: “We won't eat cake, we'll eat fire and ice and destruction because we're angry.”

In a second clip he said: "They broke the moral law, we're going to break all the laws."

Prosecutor Duncan Penny told the court that on that day the 21-year-old, from Billingshurst, leapt on the bonnet of a Jaguar car in a royal convoy containing Prince Charles and Camilla.

He is accused of throwing a rubbish bin that appeared to hit the car but this was disputed by his defence.

Gilmour was also accused of attacking the front window of Topshop's flagship store in Oxford Street and making off with the leg of a mannequin that had somehow come into his possession.

The total cost of the damage caused to the store by the mob Gilmour joined was more than £50,000, the court heard.

The Gilmour family own a farm near Billingshurst and a £3 million six-storey mansion in Hove.

After he was pictured on the Cenotaph the student apologised for the “terrible insult” to the country's war dead.