Internal plumbing problems in our brand new Elddis

We have an Elddis 540 bought in Nov 2011, we visited the Club site in Bury Lancashire 5th - 8th March 2012 and discovered that all the joints in the pipework leaked. We are very grateful to a lovely couple, also in an Elddis who gave us the name of an engineer who came out to us the following evening. They had ahd the same problems. We had another repair at the dealership, collected our van and went off to a club affiliated site in Warwickshire only to discover the joints leaking again.  We had 30% damp in the front seat joint and the laminate has come away in a patch in the rear bathroom.  Has anyone else had similar issues?