the link you have given via e bay is for riversway leisure in preston, we bought our first cadac 5 years ago from them and ive just received the latest model as a christmas gift that allso came from riversway, they are more often than not the cheapest place to purchase cadacs.
the cadac for us is an essential piece of kit, my family is now basically 4 adults as the kids are grown up (alegedly)so to cook even a breakfast in the van can take a very long time, on the cadac i can get a full english for 4 adults cooked in around 20 mins and cleaning the cadac afterwards is a simple case of a spray with degreaser and rinse under the hot tap in the pot wash area.
we use the van every 3 weeks summer and winter for weekends away but we no longer use it for our main holiday as we like a bit of sun once a year ! but each october we do go to the isle of wight for a fortnight and allways go to b&q to buy a cheap charcoal barbeque, we use this for the fortnight then just put it in the recycling area, we do this as normaly we have 3 vans with a total of 9 adults and 3 kids to feed.