After solving my first problem, I have another…
So when I access by domain via the url shanerobinson.co.uk all is ok and I get a secure connection with the padlock.
However, when I access www.shanerobinson.co.uk I get a security warning from the browser.
I'm unsure if this is a server issue, wordpress, or DNS.
I've got my domain with google domains and the DNS is set to…
NAME @, TYPE A, TTL 1h, DATA (Static IP address of my instance)