[1] Stewart-Wilson grew up on military postings in the UK, Germany, and Austria before her family settled in London, her father becoming an Equerry to Queen Elizabeth II.
Her next two roles were one-time appearances in the British sitcom Goodnight Sweetheart and playing a secretary in a TV adaptation of Agatha Christie's Poirot story The Murder on the Links.
She also made an appearance in the mockumentary feature film Razzle Dazzle: A Journey into Dance, and played a cameo role in Stephen Poliakoff's Joe's Palace in a scene with Michael Gambon.
In August 2010, Irish band Pugwash announced that they would be including a song called "Dear Belinda" on their album The Olympus Sound, the track being written as a tribute to Stewart-Wilson for her 40th birthday.
[3] Between 2011 and 2014, Stewart-Wilson appeared in the critically acclaimed TV film about Monty Python, Holy Flying Circus, as well as the period drama Ripper Street.
In 2018, Stewart-Wilson had a recurring role in series 32 and 33 of Casualty, appearing in several episodes as Ciara Cassidy, fellow alcoholic and love interest of consultant doctor Dylan Keogh.