Hi John,
Thank you very much for your time and patience with me, yes you are right my Contact and About page appearing in Google searches, these are set up as Layout pages. My Homepage and Work page (set as Index pages) do not appear in searches, which makes me think that there is an issue with Index Pages and Google indexing them.
I've been in touch with Squarespace support, who are saying that my Homepage Index Page is set up as priority 1 for Google to search/index it and they are not aware of any issues regarding NOINDEX for homepages set as index pages. Apparently I should wait