"Heath Ledger was the dude," says co-star Andrew

"It was that moment when you go 'Okay, God doesn't exist. There is no one watching over us'. You question everything. He was unjustly snatched away.
"Obviously we all wish the film had been completed with that dear man still alive.
"The best version of the movie, the best version of the world would be one where Heath was still alive."
By a strange coincidence Heath had been heading for Andrew's birthday party when he rang Terry to say he'd heard he was interested in using the young actor, who had won a BAFTA as best actor for the TV Film Boy A and been named a Shooting Star at the Berlin Film Festival for his work on Robert Redford's Lions for Lambs.
Los Angeles-born, Surrey-raised Andrew had captured the director's interest after making an audition tape with his girlfriend and sending it to the Monty Python animation man, who cast him as Anton.
The story Terry has woven is of a travelling theatre troupe led by the ancient Dr Parnassus (Christopher Plummer) and his daughter (Lily Cole).
Verne Troyer and Andrew are the loyal players. Tom Waits is the Devil who is gambling for the doctor's daughter and Heath a mysterious man the troupe discover hanging from a bridge one rainy night.
The troupe are the gatekeepers to an an alternate universe that audience members can enter via a magic mirror - what they find inside is a result of their inner most desires and Terry's fertile imagination.
Because of this shifting reality it meant that Terry was able to complete the film after Heath died. Johnny Depp, Jude Law and Colin Farrell came forward to see if there was anything they could do to help and became "through the looking glass" versions of Heath's character, Tony.
"It was a real act of kindness and generosity from them and it was a testament to how Heath had touched them that they took time out of their very busy lives to come and make sure that his incredible work was seen," says Andrew.
"It was an ugly thing that happened so the fact that they came in with the energy that they did, good on 'em.
"I don't care if it works or not, if it makes the film better or worse, I am just glad we finished because I am sure Heath would have been pissed off if we hadn't. I think he would have been 'You idiots. You f*****g morons'."
Andrew developed a close friendship with Heath while filming, the latter's confidence at improvising, fueled by his off-the-leash performance as the Dark Knight's nemesis, encouraging Andrew too try and compete.
"Having worked with Terry before he knew exactly what he was stepping into. He knew how free he was going to be so he came totally prepared. I'd never been given that opportunity before.
"He was a charming f*****. he had that thing, he was the man, the dude."
The two bonded even further when they spent a night dangling beneath a London bridge as Anton attempts to rescue the unconscious and asphyxiating Tony.
"I was very excited about it," says Andrew. "I thought it would be a unique experience. Uniquely painful. I was in a hip harness so when I went upside down it was just my pelvic bones taking all the pressure. It felt like I was going to slip out. I thought 'this can't be safe' but I was assured it was.
"For the bit where Heath falls there was a strap that went up from my hip and down my arm and was attached to a harness round his hip, so I was taking two men's weights. It was awul.
"It was the toughest might of the shoot but I probably had a view of the Thames that has never been seen before."
Andrew is currently dividing his time between London and Los Angeles where he has completed a short film for Spike Jonze, as a lovelorn robot.
He has also started rehearsals for The Social Network, the story of the founders of Facebook, starring opposite Justin Timberlake and Jesse Eisenberg. David Fincher directs from a script by the West Wing's Aaron Sorkin.

The Imaginarium of Doctor Parnassus is on general release in cinemas now.