A top Tory councillor claims he has quit his party in disgust — after Boris Johnson's failure to deal with a string of Covid breaches in his own ranks.Hugh Hunter has stepped down from the South Ayrshire Conservative Group after 25 years as a party member.He spent 23 of those as a sitting councillor, including a spell as the authority's leader.But he insists open anarchy within Tory quarters proved the "last straw" and led to his early departure from the party this week.It follows his failure to be reselected for the Conservative team at next May's elections.Cllr Hunter, 76, earlier claimed he had been the victim of an "ageist" internal policy in being dumped.Now he has dropped a bombshell by walking early and will serve the remainder of