Re: Don't load third-party scripts
"The other non-first party resources are frequently trackers which don't belong on a true public/gov't site."
Yup.
Google analytics might be "cool" in terms of the statistics it can generate but there are standard stats packages for that which don't use JS, don't slurp up all your personal details to Google - and don't miss people like me who block that website.
It would be interesting to see the ICO asked why they expect visitors to run JS from Twitter and Google, given their focus on data security and personal information privacy.