Doon frae Troon
Ryder Cup Winner
No, the fact that they choose not stand candidates outside Scotland means she is certainly not the leader of UK national party. Being called the Scottish National Party is a big clue that they represent the nation of Scotland not the UK. Not fielding candidates anywhere other than Scotland proves that they are only representing the Nation of Scotland and are therefore not a UK national party.
Why are you suggesting they are a UK national party when their whole ideology and purpose of existing is not to be.
How about because at the moment they are a political party within the UK.
Or is that too simple for you.