My dilemma is over condensation. In the old days excess moisture escaped via draughts or condensed on windows. Now we have few draughts and double-glazing it condenses inside cupboards - and I am concerned about wood panelling and furniture next to the kitchen. The wood is cold enough for steam from cooking to make it wet. Either I have to keep the house warmer or open a door or window or use the extractor fan.

Laurie: The extractor fan is the best option. Of course, the air it removes is replaced by cold air from outside (through cracks, keyholes) although not as much as opening a door.
The hi-tech solution is to get a heat exchanger, which extracts the heat from the air in your kitchen to warm up incoming air. But these cost over £1,000.
Better insulation will cut condensation. Get cavity walls filled (your electricity or gas company may do this at a reduced cost). Is there a space behind your wood panels that you could easily fill with insulation?