Ackland was born in North Kensington, London on 29 February 1928, the son of Major Sydney Norman Ackland (died 1981), an Irish journalist who had been sent to England to live with an aunt by his parents for seducing their maid, but subsequently seducing his aunt's maid, Ruth Izod (died 1957), whom he married.[3][4][5] He was trained by Elsie Fogerty at the Central School of Speech and Drama, then based at the Royal Albert Hall, London.[6]
Ackland and Rosemary Kirkcaldy were married on 18 August 1951, when Ackland was 23 and she 22.[7] She was an actress and Ackland wooed her when they appeared on stage together in Pitlochry, Scotland.[8] The couple struggled initially as Ackland's acting career was in its infancy.[7] They moved to Lilongwe, Malawi,[when?] where Ackland managed a tea plantation for six months but, deciding it was too dangerous, they moved to Cape Town, South Africa.[7] Though they both obtained steady acting jobs in South Africa, after two years they returned to England in 1957.[7][9]
Ackland appears in the Pet Shop Boys' 1987 film It Couldn't Happen Here, and in the video for their version of the song Always on My Mind, which was taken from the film.[13] Several years later, he said in an interview with the Radio Times that he appeared with the band purely because his grandchildren liked their music.[citation needed]
In a 2001 interview with the BBC, Ackland said that he appeared in some "awful films" due to being a workaholic. He said that he "regretted" appearing in Bill & Ted's Bogus Journey and the Pet Shop Boys music video. He also criticised former co-star Demi Moore as "not very bright or talented".[9]
Also in 2007, Ackland appeared in the film How About You opposite Vanessa Redgrave, portraying a recovering alcoholic living in a residential home after being forced to retire and losing his wife to cancer.[15]
In 2008 he returned to the small screen as Sir Freddy Butler, a much married baronet, in the ITV1 show Midsomer Murders. The episode, entitled Vixens Run also featured veteran actress Siân Phillips.[16]
Ackland and his wife Rosemary were married for 51 years. They had seven children, thirty-two grandchildren and eight great-grandchildren.[18] Despite his filming taking him to far-flung locations, he said Rosemary and he "were hardly ever apart".[19] Daughter Kirsty married Anthony Shawn Baring, a descendant of the merchant banker Sir Francis Baring, 1st Baronet and a descendant of Robert RundellGuinness, founder of the merchant bank Guinness Mahon.[20][21] In 1963, their house in Barnes caught fire. Rosemary saved their five children but broke her back when jumping from the bedroom window.[22] She was told she would miscarry and never walk again, but later gave birth and, after 18 months in Stoke Mandeville Hospital, walked again.[23][7]
Their eldest son, Paul, died of a heroin overdose in 1982, aged 29.[24] In 2000 Rosemary was diagnosed with motor neurone disease; she died on 25 July 2002.[25]
In 2020, Ackland participated in the Letters Live project, and was recorded from his home in Clovelly, Devon.[26] His letter reflected on the COVID-19 crisis and his hopes for how the country could draw 'strength from adversity'.[27]