Thanks Laranz, that’s working for some of the icons (search icon).
But now I see that xstore-icons is also loading, this includes the cart/bag and the search close.
I’ve tried adding this:
wp_enqueue_style( 'prefix-xstore-icons', 'xstore-icons.css', array(), '4.0.3' );
and putting a new file called xstore-icons.css in my child theme with the paths to the fonts changed to absolutes. It hasn’t worked.
Any ideas?