A Cornwall councillor has defected from the county's Liberal Democrats to Cornish devolution party Mebyon Kernow.
The move, by Penzance Central councillor Tamsin Williams, brings the number of Mebyon Kernow members on the 123-seat Conservative-Independent led unitary authority up to six.
She said she had moved to a party "free from the vested interests that dominate the London-based parties".
She has served on the unitary council since it was formed in 2009.
She served on the former Cornwall County Council from 2001 to 2009.