I have managed to work this out…for anyone wanting to do the same the code is:
add_filter( 'woocommerce_order_get_items', 'woosb_exclude_bundles_from_order', 10, 1 );
function woosb_exclude_bundles_from_order( $items ) {
foreach ( $items as $key => $item ) {
if ( $item->meta_exists( '_woosb_parent_id' ) ) {
unset( $items[ $key ] );
}
}
return $items;
}