Would be worth another look at your mobile variant for https://www.reversediabetes.com.au/. On my mobile the NavBar submenu exceeds the page width and the top of page button is only half visible.

Maybe it would look better with a solid background on your menu layer? you could group all the social icons together on this layer too.

Click image for larger version. 

Name:	RD Mobile Menu.jpg 
Views:	390 
Size:	62.3 KB 
ID:	126031

Xara's standard Navbar submenu is a bit primitive, but from a user navigation perspective maybe retain links to all pages? As you only have a submenu on the About tab, you could use a standard NavBar for your submenu navigation too.

Click image for larger version. 

Name:	RD Desktop Menu.jpg 
Views:	403 
Size:	72.6 KB 
ID:	126032

The same principle could apply to a mobile variant, although I prefer a separate inclusive mobile menu page for ease of navigation.

Click image for larger version. 

Name:	RD Mobile Menu Page.jpg 
Views:	385 
Size:	32.1 KB 
ID:	126033

Hopefully some help here.