Voting for SNP doesn't mean you want independence. If I had the option of voting for a party that wasn't Tory and specifically prioritised the region I live in then I would. Labour might be better than the Tories but for Scottish people Labour still won't prioritise them like the SNP do. If they dropped the N and were just called the Scottish Party then I'd wager they'd still be doing just as well. Scotland are a huge voice in Westminster now and they make sure Scottish issues are always highlighted. They are way more effective than the Welsh and Northern Irish equivalents. Many people will vote SNP despite wanting to be part of the UK and there will be many Scottish Tory voters that would like Independence.Okay but the independence campaigns in places like Yorkshire and Cornwall are tiny. That's the difference. And it does make Scotland at least partly unqiue from the rest of the UK. Nowhere else in the UK is there an independence party getting the kinds of numbers Indeedido's quoting (even though he makes them sound small fry...)
Mebyon Kernow, the Cornish independence party, stood 1 candidate in 2019. They got 1,660 votes. 3% of the vote in their constituency.