I’d actually already seen that post while searching Google but then lost the url and couldn’t find it when searching the forum so thanks for the link.
I tried adding priority to the genesis_do_nav as discussed but it would either sit above the slider from 0-11 and then jump below all content at 12.
In the end I added a priority of 1 to epik_home_loop_helper_top in home.php and it’s sorted it straight away.
add_action( 'genesis_after_header', 'epik_home_loop_helper_top',1 );
Thanks for your help.