Thanks for the advice...I've just got hold of a moisture meter from Ebay and I get very different results from you.I have had a couple of problems with my Eos (see my previous posts). I purchased a cheap humidity detector (the 2 prong type used for measuring damp in walls) and check mine regularly now by pushing it well into the carpets. It cost me about £10 on ebay and well worth it. Depending on the weather it reads from zero to about 7 per cent by the door sills if it has been very wet. It may save a lot of time identifying the cause as the carpets are not the easiest to get up.
I seem to get a consistent reading of around 15%. I guess that different meters will have different sensitivities, but what is a reasonable moisture content given that its currently damp and cold in the UK?
If I try the carpet in the office where I work it shows 0% to 1% so there is definitely moisture in the car, I just don't know if it is to be expected.