Thanks very much for the suggestions @supernovia
I had quite a bit of discussion with the new web host yesterday and they managed to resolve the issue with featured images not showing — it was a plug in issue but they didn’t say precisely what. They did suggest that the other problems are likely plug in related too.
I’ll give jetpack a whirl and see if it resolves things for the contact form. The alternative seems to be to install a dedicated plug-in for forms.
Thanks again!
