In a statement, the AIM-listed firm said it is intended that Jonathan Ballard, currently Inspiration's financial controller, will become the group's chief financial officer with effect from 1 July 2020.
It added that Briant has agreed to continue to work with the group during a handover period which will end in November 2020.
The group said a further announcement concerning Ballard’s proposed appointment to Inspiration’s board will be made in due course.
Neil Campbell, Inspiration's CEO commented: "On behalf of the entire Board, I would like to thank Mike for his contribution to the Company over the past three and a half years.”
He added: “I am also pleased that in Jon Ballard we have developed a strong successor to Mike. Jon has been with the business as Group Financial Controller for over three years and, along with the rest of the Board, I look forward to working with him as CFO in the coming years."