Hi - thanks for your reply.
We rely on organic Google searchs mostly but also quote our URL in social posts and include it on our email signatures and any other marketing materials.
I may try reducing the height of the headers. I can see exactly what you mean on mobile view. As far as I could make out, what you see was the standard responsive transition offered with the theme I'd chosen (Clarkson).
Other than that I felt I'd included lots of options for click-throughs on the home page.
I don't have dropdown menus, could that be an issue?