Though the northern portion of the former Western SMT's operating area, covering Inverclyde, Renfrewshire and the Isle of Bute, was ceded to a new company, Clydeside Scottish, in June 1985 (in order to prepare the Scottish Bus Group for deregulation in 1986 and eventual privatisation), Clydeside Scottish was remerged with Western in May 1989.
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For membership, it drew upon Junior football teams based in the south-western Scottish counties of Ayrshire and Renfrewshire.
This would add local bus operation around Irvine, Stewarton and Troon, and would consolidate the Stagecoach Western operation, securing it as the dominant operator in north Ayrshire, a role Western Scottish never succeeded in filling.