The chief executive of Brighton and Hove Council has unexpectedly asked for early retirement. Alan McCarthy, who took up the top position in 2004, said he wanted to find new challenges, but local media speculation has focused on a series of rows between the city's senior officers and the Conservative administration. Mr McCarthy said: ‘I have had four brilliant years as the chief executive of the city council, and 12 in total. ‘But I now feel it is time to take on some new challenges and to allow fresh talent to help unlock the tremendous potential in the city.' Council leader, Mary Mears, said: ‘I want to thank Mr McCarthy for all his hard work over the years and wish him well. I hope he will continue to make a positive contribution to the city.' Cllr Gill Mitchell, leader of the opposition Labour group, said: ‘Mr McCarthy is a very well respected chief executive who is held in high regard by other city leaders who will be shocked at his departure'.