Jos Buttler is to stay as chief, with colleague mentor Marcus Trescothick put in brief charge for the series against Australia in September.
Australian Mott, 50, was designated when Britain split the lead trainer jobs in 2022 and sometime thereafter managed the victory at the T20 World Cup in his nation of origin.
Yet, Britain, champions in 2019, got through a disastrous 50-over World Cup in India last year, winning just three of their nine matches.
Also, they gave up the T20 title in the Caribbean and US in June, beaten in the semi-finals by possible bosses India.
A race to the last four appeared to be a base necessity for Mott to keep his work, however Britain figured out how to win only one of the four games they played against other Test-playing sides.
Following the T20 World Cup, Britain overseeing chief Burglarize Key offered no affirmations that Mott or Buttler would remain in their jobs.
Key has looked into the competition and held chats with the two men. Buttler is to remain on and Mott exits two years into a four-year contract.
Britain will presently search for a lead trainer to work towards the following significant competition, the Heroes Prize in Pakistan in Spring.
“After three World Cup cycles in a short space of time, I currently feel the group needs another bearing to plan for the difficulties ahead,” said Key. “This choice was not made delicately, yet I accept it is the perfect opportunity for the group’s future achievement.
