Grant, who is best known for starring in romcoms including Notting Hill and Four Weddings and a Funeral, did not appear in the third film.
He said that initially, he felt there was “absolutely no role” for his character, Daniel, in the fourth version either.
“But they wanted to cram me in,” he said.
So he said he sat down with producers to help shape the character, who was known in the earlier films for being a serial womaniser.
“I felt that what they proposed was fine, but not great.
“And I felt that he needed a third dimension, he’s in his 60s now, you can’t just have him smoothing his way down King’s Road eyeing up young girls.
“Something needs to have happened to him in the interim.
“So we invented a rather good – I invented a rather good – interim story.”
The final version got his approval, he said.
“It’s actually a very good and moving script. And I say that as someone who’s horrid about scripts. This was brilliant.”
