I have divided this in to two sections, one for sites abroad and one for sites in the UK.
Photos of campsites worldwide Campsite Register
Photos of French Aire de Services and German Stelplatz Aire de Services
More Photos and the exact positioning, on a map, of these campsites and others campsites, can be found on a Flickr group simply named Motorhome. You can view or even join the group by following this link, then click on map.