Rupert bought a house in Manchester on 1 November 1998 for £75,000. He occupied the house as his principal private residence until 1 November 2002 when he left to work abroad for a year, living in rented accommodation. He moved back into his house on 1 November 2003 and stayed until 1 August 2007 when he left to work in Aberdeen, again living in rented accommodation until his return on 1 November 2011. This time he stayed for three years, leaving on 1 November 2014 to go to live with a friend. He never returned to the house and it was sold on 1 March 2021 for £343,000.

During his absences, Rupert always let his house in Manchester and claimed no other property to be his principal private residence. He also let rooms (comprising one-sixth of the house) to a tenant between 1 November 2003 and 31 July 2007. Compute the chargeable gain arising on the March 2021 disposal.