"John is an incredibly busy composer, and as a composer there can sometimes be terrible clashes in your schedules, and you can't do everything," said Patrick.

He has worked with Goblet of Fire director Mike Newell twice before. "He's just great, we get on terribly well, and I was thrilled to be asked. It certainly went down a storm in my house," he said.

"I read the script before they started shooting. My involvement has gone on for a year, and I've written zillions of themes for it.

"People who have read the book will know that it is very dense in terms of its storyline, and all of the imagery is very big."

Other departments involved in the film had put in immense efforts. He said. "When it comes to your turn, you feel this huge Goliath-type presence.

"Nothing has been a breeze. Everything demands the most of you. You have to be at the top of your game.

"It's an enormous presence, the biggest thing I have ever been involved in, and you feel the enormity of it all."