We have friends who have a choice of buying either a 1998 Bailey 470/4 for about £3500 or a slightly later year 510/4 caravan for about £4600. As they are very concerned about damp they have purchased a reasonably good damp meter. Is there any sort of guidance on the Internet where they shoudl be checking for damp in a caravan? Obviously they will be doing their CRIS check before handing over any money.