Sir Michael Caine has revealed he has officially changed his name by deed poll after finding himself getting delayed at airport security.

The actor had his real name Maurice Micklewhite on his passport but found himself being constantly asked about it.

The 83-year-old told The Sun: "I changed my name when all the stuff started with ISIS and all that."

Referring to his airport security experiences, he explained: "He would say, 'Hi Michael Caine,' and suddenly I'd be giving him a passport with a different name on it.

"I could stand there for an hour. So I changed my name."

Sir Michael abandoned his birth name in 1954 when his agent told him he had to find a new one quickly.

Speaking to his agent from a telephone box in Leicester Square, London, he looked around for inspiration and saw that Humphrey Bogart's The Caine Mutiny was being shown at the Odeon and decided to change his name to 'Michael Caine'.

Sir Michael is currently starring in Now You See Me 2 which is in cinemas now.