The SNP "collapsed" behind the Tories to third place in a council by-election on Thursday as Labour won the seat.
The Nationalists lost more than a quarter of their vote in the East Kilbride West ward on South Lanarkshire Council.
Labour candidate Kirsty Williams won the seat after taking 1386 first preference votes. The Tories' Bill Dorrian finished in second on 904 with the SNP's Robert Gillies trailing in third on 778.