On Sun, 20 Apr 2008 23:36:04 GMT, The Medway Handyman wrote:

Would a 1930's house have cavity walls?

Might do but my parents semi of that age didn't, solid 9" brick walls.

Ceratinly sounds like condensation. I wonder if the place has been fitted
with double glazing sans trickle vents? Does any area that has water
vapour present (kitchen, bathroom etc) have decent extract ventilation,
that is used? Are clothes routinely dried indoors?

Extract ventilation of kitchen/bathroom etcto remove high levels of water
vapour will probably cure it. Assuming it's not gutters/downspouts/over
flows etc

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Cheers
Dave.