Charles is Michael Harbinson in Starter for ten in 2006, a cameo

 with Lindsay Duncan, they work in 1984 , in Rainy day women

                                                 Charles naked at 06: 10mn

https://aboutactorcharlesdance.blogspot.com/

Nowadays, James is working with other impressive bodies - including that of Britain's Charles Dance. James has had no problem tackling nude scenes - but he found the boot was on the other foot in Starter For Ten. James kept his pants on, while Dance and the still-glamorous Lindsay Duncan paraded around in the buff.
"In one scene, they both turn up in front of me naked," he explains. "Lindsay had a towel to cover herself, and when the cameras stopped rolling, she'd cover herself up."
But 60-year-old Dance insisted on striding around nude even though the movie never intended showing the Gosford Park star below the waist.
"What a man," laughs James. "He did the scene stark naked. When the cameras stopped rolling and they offered him the chance to put something on, he said 'No, I'm fine darling!'
http://www.jamesmcavoy.com/index.php?name=News&file=article&sid=223

 JAMES MCAVOY was staggered when his STARTER FOR TEN co-star CHARLES DANCE appeared before him completely naked on set - because the veteran star was surprisingly well-endowed. The young actor plays Dance's son in the upcoming movie, who in one scene accidentally sees his parents in the nude. But while wardrobe had ensured they would not have to strip off completely for the scene, Dance was determined to show off his assets. MCAvoy says, "LINDSAY (DUNCAN) wore something that covered her up so she looks naked though she wasn't. "But Charles shocked us by coming down the stairs stark naked. "When the wardrobe assistant offered to cover him up, he said, 'No need, darling.' "I have to say the man is quite an Adonis, Younger men felt quite threatened."

                                                                 the UK premiere