Okay, it seems to have been a cache issue. using featured image has worked.
Thank you.
Hello, Quick update, i’ve noticed this is what sets the image
‘image_url’ => WC_Predictive_Search_Functions::get_product_thumbnail_url( $item->post_id, ‘shop_catalog’, 64, 64 ),
I can see how this works for products, but how do I alter it for the page? setting a featured image has not helped.