Knocked this up earlier to make a point elsewhere, from 2016 results- the comparison between polling and actual results.
Cons under-polling - "Shy tory" effect?
Labour - bang on
SNP/LD - slightly over-polling vs results.
Green over-polling (not sure why? some turnout issue?) pic.twitter.com/jax3CEHS0a

— Peter MacDonald (@BlackIslePMD) April 28, 2021