I'm not sure the activities of the authorities in Catalonia or Quebec are relevant to the situation in Scotland.
As for the Met or other UK security organisations, I am reminded of a disclaimer I've often read... Past performance is no guarantee of future results.
If the UK security organisations are wasting their time on infiltrating the SNP and the Independence movement. They need emptied what a grotesque waste of resource.
This chat always makes me laugh. It's almost as bad as the twitter crazies who think Salmond has always been an agent of MI5.