Edit the price field to remove the £ sign

// Edit the price field to remove the £ sign
add_filter( 'rank_math/snippet/rich_snippet_product_entity', function( $entity ) {
    if ( isset( $entity['offers']['price'] ) ) {
        // Remove £ or any non-numeric characters except . and ,
        $entity['offers']['price'] = preg_replace( '/[^0-9\.,]/', '', $entity['offers']['price'] );
    }
    return $entity;
});