SwingsitlikeHogan
Major Champion
None of which makes the SNP relevant to the rest of the UK.
If we were to have a vote in any future independence referendum it would be a different matter.
If the rest of the UK were to wish the union to remain intact then it is vitally important that the Conservatives and Labour parties in Scotland are able to counter what the SNP say - so what the SNP say then matters for the Conservatives and Labour parties in Scotland. But whatever these parties might say is currently undermined in the view of many Scots by their take on the Westminster parties; their policies and the voting intentions of the rUK.
Plus some areas of policy are not devolved to Holyrood. And so if Westminster parties policy is divergent from that of the SNP, then that again is grist for the mill for the SNP (Brexit being the obvious example); and of course the funding of many services in Scotland is determined through the Barnett formula upon the spending on the equivalent services determined by Westminster. Not that any of the above seems to matter one iota to Labour and Conservative Westminster parties - maybe they should give it a bit more consideration if they wish the union to remain intact. If not that bothered - then bash on!