Spoke too soon, works on the variable products but it seems like the simple products are now showing a similar error.

Notice: Undefined variable: is_b2b_user in /var/www/5c.dev.thepreview.site/wp-content/plugins/b2bking/public/class-b2bking-public.php on line 671

Screenshot attached.

Thanks!

All looks good now, thank you very much for your quick response and code updates!