I would look for any signs outside where the water could be getting in around that area and then if nothing obvious wait for the service. A pic would be good. I am not a great lover of damp meters as you can get a lot of false positives if not careful, especially in a caravan where there is moisture on most every surface especially when they are sitting empty
Hi Gray and thanks for the reply, I popped out again today as its been a couple of weeks since I packed everything away and put the cover on. Nothing has changer the inside is exactly as it was before with just this little bit of delaminating, I cant see any signs of damp any where, how ever I will invest in a meter and check it out properly. It is due a service so I could ask them to check it too. Having seen that its still the same today Im not to concerned about it, I was expecting to see mold every where. I have left some de humidifier packs in there, the sort with granules and a catch tank, we have used them before and if there is any moisture in there they will show it.