Hi Norman, I've not been to Ypes yet and the best I can do is to tell you about the site we've booked this August. It's called "Camping la paille haute" and is east of Arras at a place called Boiry Notre-Dame. E-mail, ch.n.choquet@wanadoo.fr
Perhaps it's not quite what you're after but if there's nothing else. They do have a web page but is under construction at the moment.