Hello Ciarán,
Sorry to bother you again with this (https://www.joomla51.com/forum/sidecolumn-position-on-mobile-after-component).
On my clients website on mobile view the sidebar module is visible above the maincontent. When clicking on the screen or scrolling down the module 'jumps' to the bottom.
Maybe you have another suggestion to fix this?
Thanks!
Ton