Rattigan believed in understated emotions, and craftsmanship, which after the overnight success of John Osborne's Look Back in Anger in 1956 was deemed old fashioned. Rattigan responded to his critical disfavour with some bitterness. Some churlish interviews served only to confirm the view that he had no sympathy or understanding of the modern world. His plays Ross, Man and Boy, In Praise of Love, and Cause Célèbre, however show no sign of any decline in his talent.
He was a gay, with numerous lovers but no long-term partners. It has been claimed that his work is essentially autobiographical, containing coded references to his sexuality, which he kept secret from all but his closest friends. There is some truth in this, but it risks being crudely reductive, for example the repeated claim that Rattigan originally wrote The Deep Blue Sea as a play about male lovers, turning into a heterosexual play at the last minute, is unfounded. His female characters are written as females and are in no sense 'men in drag'.
He was diagnosed as having leukaemia in 1962 and recovered two years later, but fell ill again in 1968. He disliked the so-called Swinging London of the 1960s and moved abroad, living in Bermuda, where he lived off the proceeds from lucrative screenplays including The V.I.P.s and The Yellow Rolls-Royce. For a time he was the highest-paid screenwriter in the world. He was knighted in the early seventies and moved back to Britain, where he experienced a minor revival in his reputation before his death. He died in Hamilton, Bermuda from bone cancer in 1977 at the age of 66.
Fifteen years after his death, largely through a revival of The Deep Blue Sea, at the Almeida Theatre, London, directed by Karel Reisz, Rattigan has increasingly been seen as one of the century's finest playwrights, an expert choreographer of emotion, and an anatomist of human emotional pain. A string of successful revivals followed, including Man and Boy at the Duchess Theatre, London, in 2005, with David Suchet as Gregor Antonescu, and In Praise of Love at the Chichester Festival Theatre and Separate Tables at the Royal Exchange, Manchester, in 2006. His play on the last days of Nelson, A Bequest to the Nation was revived on Radio 4 for Trafalgar 200, starring Janet McTeer as Lady Hamilton, Kenneth Branagh as Nelson, and Amanda Root as Lady Nelson.
Several of his later plays were adapted for film and/or television. The best-known are: