Why don't they go for parliamentary elections that follow the Scottish system?

The problem isn't how they're elected but the fact that they are elected at all. The British parliament has been exposed as a den of thieves, shysters, petty crooks,liars, fornicators,philanderers,whore-mongers pornographers and corrupt yes men who's first priority is lining their own pockets and who's second priority is pandering to bent bankers and other criminal elements who fund their parties. Most of them should be behind bars.