Winter is now upon us and many will be using stoves for heating. Please do not be tempted to block the BSS vents as the slightest leak from the stove could kill you with carbon monoxide. The cooker will be doing its best in that direction and making more condensation if not well ventilated. Have a sniff around the stove surround when the stove is running hard. Ceramic tiles over plywood are a potentially lethal combination so the slightest whiff of charring wood needs very urgent investigation.
I trust those who left boats tied up for the winter have also left the window hoppers or similar open (not above the bed and upholstery) to maximise ventilation and minimise condensation. Remember to wedge the fridge door open to minimise the mould that grows in closed fridges that are turned off.
If you run a dehumidifier when away, block all vents or you just try to dehumidify the whole atmosphere. Check the under floor bilge is dry or the dehumidifier will act as a very slow bilge pump.