The actor, 77, who played the older Louis Mountbatten in the Netflix series, showcased his toned physique as he strolled along the sands before taking a cool dip in the ocean.
The veteran actor, 77, told of his huge regret that his relationship with sculptor Joanne Haythorn came to an end when they divorced in 2004 after he admitted he had cheated on her.
The couple - who met on the set of his 2020 film, The Book of Vision - braved the freezing temperatures in the capital to get some exercise in the fresh air, on Thursday