Okay, I've been to see the Hymer. The owner told me that they had damp in wardrobe and garage but it had all been repaired by the local Hymer dealer and it passed it's habitation check last November. So I used my damp meter that I got off Amazon and too my surprise the highest reading was 6% until I tried under the kitchen window where it was 49% and one part of the garage was 47% Would this be acceptable? Should it have been picked up in the habitation check? There is no visible evidence or smell of damp. They have the full service history from new and all the damp repairs are documented.