Labour's stunning by-election victory in Scotland signals threat to SNP dominance

Labour won the Rutherglen & Hamilton West by-election with 17,845 votes, defeating the SNP candidate by 9,446 votes.
The swing from SNP to Labour was 20.4%, much higher than recent opinion polls had suggested.
Experts predict that if replicated nationally, Labour could gain around 40 seats in Scotland.
The result poses a serious challenge to First Minister Humza Yousaf and the SNP's push for independence.
Low turnout of 37.19% suggests voter dissatisfaction and lack of faith in major political parties.