Cllr Nigel Pearson, representing the Chard North division of Somerset County Council, has quit the UKIP group on the local authority following what he called "irreconcilable differences between myself and the chairman of the UKIP Somerset County Committee".
The Conservatives retained majority control of Somerset last May, though with a reduced number of seats - down to 29 out of 55. UKIP broke through to win their first seats, though they only took a relatively modest 3 - now down to 2 with Pearson's defection.
Somerset County Council's makeup is now as follows.
Conservative - 29
Lib Dems - 18
Labour - 3
Independents - 3 (+1)
UKIP - 2 (-1)