I don’t know if writers get to say what the headline should be these days but the above ‘attention-grabber‘ conceals the key facts which most readers, headline-surfers, won’t see.
In the article:
An SNP spokesperson said: “The SNP is the only major UK political party to see a rise in membership income last year.
“Although our overall membership fell by 1.5%, that’s dwarfed by the mass exodus of 18% of Labour members and 25% of LibDems last year.”https://www.heraldscotland.com/politics/20668426.snp-loses-almost-fifth-members-just-two-years/?ref=twtrec
Note: Many of those leaving seem to have done so only to save money during a tough time.