Ed Miliband was given the backing of a host of celebrities from the arts and sport in a star-studded rally as the election enters the final straight.

Hosted by Harry Potter star Jason Isaacs, who declared he was a "die-hard supporter, around 700 Labour activists watched on as famous names endorsed the party leader.

Rocket Ronnie O'Sullivan, who sat in the audience, revealed in a video that he had avoided the ballot box in the past but was now throwing his support behind Labour.

Comedian Paul O'Grady told the crowd that he was considering moving to a "house on a Lido in Venice" if the Conservatives were returned to power on May 7.

"I cannot live under this Conservative... this coalition anymore," he said.

O'Grady, who has suffered three heart attacks, said intensive care had become like the "back of a pound shop" under the coalition.

Gavin and Stacey star Mathew Horne paraphrased former Labour prime minister Tony Blair's "education, education, education" mantra, shouting "Ed, Ed, Ed".

"Ed is my choice and I hope he is yours too," he added.

Actors Michelle Collins, Natascha McElhone and Richard Wilson, along with presenter June Sarpong and artist Grayson Perry also turned out.

At the rally, staged at the Royal Horticultural Halls in central London, supporters were shown a video of O'Sullivan trouncing Mr Miliband on the green baize after the Labour leader took an hour out from the campaign trail to shoot pool with the five-time world champion in Sheffield.

Mr Miliband is a big fan of O'Sullivan but recently warned him to "watch out" after performing a stunning trick shot during a game with ITV's Tom Bradby during filming for the Tonight programme.

But he was unable to replicate the success when confronted by the snooker legend, losing three nil.

Mr Miliband joked afterwards: "I took it easy on him."