I decided to check out if I had a damp problem today and indeed I do! The foam the PSE pump sits on was damp as was the foam around the roof pump. These are now drying out in the airing cupboard! I was thinking about wrapping these in a plastic back to stop them acting like a sponge if water does get into the boot. I've also cleared the drain holes so hopefully that should help too. Has anybody got any other solutions that I should think about?