Councillor Matt Relf, executive lead member for growth, regeneration and local planning, said quitting the party was an “enormously upsetting” decision.
“The understandable controversy around Jason’s conviction and the choices he made that led to that have upset and surprised a lot of people in the group,” he said.
“With the election of a new leader we hoped that would put everything behind us, but unfortunately the decision to appoint Jason back on to the planning committee was just a step too far.
“That decision was made with no consultation with the broader group.
“To stay true to our principles of integrity and democratic accountability I was left with no option but to leave, and I think others have reached the same conclusion.”
Hucknall Central councillor Lee Waters, who was another one of the councillors to quit this week, said his decision “follows a period of reflection, and I believe the time is right to move on”.
“Throughout my time as a councillor, my priority has been to listen to residents, address their concerns and work hard on the issues that matter to our community. That remains unchanged,” he added.
“I will continue carrying out my council responsibilities and dealing with ongoing casework with the same commitment and dedication as always.”
Samantha Deakin has taken over as leader of the council, but has so far declined the BBC’s request for an interview.
The councillors who have quit the Ashfield Independents are:
Matt Relf
Lee Waters
Christopher Huskinson
Dave Shaw
Dale Grounds
Ian Briggs
Gordon Mann
Trevor Lock
Sarah Lewsey
John Wilmott
Warren Nuttall
Kier Barsby
Jason Zadrozny
