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HG mold spray and foam spray are very powerful at removing mildew (they're labelled as bathroom but ignore that) the foam is more powerful and less air bourne, they'll leave a fine residue to wipe off. [Mildew will happily live under poorly adhered lining paper slowly removing it]. You can get additives to add to any paint but the standard is zinsser perma-white (matt or satin) and that can be tinted.
bluehuw
CYOA
Thanks both
I can't see anything up in the loft particularly, though there is a small window in the roof, kind of above it (though further to the left, camera right) which I guess may contribute to the cold. There doesn't appear to be any missing insulation though the floor is boarded over so not easy to judge but nothing to indicate why that one area is suffering. When we moved in there was a free standing cupboard there from the previous owners. Was fine in the summer but when we got around to decorating after the first winter the entire wall was black (no spores around the edges so not at all visible until we moved the thing).
I don't fancy soloing a ladder up there (at the top of a flight of wonky steps, sloped surface etc) so I'll try the spray and dry approach. We've got a few months of cold and wet so hopefully time to test it.
Main concern is having to repair paintwork in 12 months time if we decorate in the summer.