Working perfectly now thanks.
I’ve also just noticed another issue, in my customizer settings in Layout>Container I have top content padding set to 0, this seems to be working fine on standard pages as the entry-content class adds a 2em margin.
However, on single posts there is no padding/spacing at the top of the page: http://tinyurl.com/gurnh64
Whats the best way to make pages/posts have the same top content padding?.