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You need to clean up the mould which is all over the cill and which by the sound of it is all over the nets. You are causing the condensation, wipe it up.
Do your windows have trickle vents or a small ventilation setting? No it doesn't it's an old style window
Apologies, I was away .
Does anybody drape wet washing inside the house, on radiators or airers? yes my wife does i will have to get this stopped
Does your bathroom have an effective extractor fan? yes it does i believe
Is rain getting in? No not at all
Do your windows have trickle vents or a small ventilation setting? No it doesn't it's an old style window
Trickle vents can often be retrofitted to uPVC units. It really can be as simple as just drilling a series of whole through the uPVC frame and then screwing on the vent covers.
https://www.amazon.co.uk/Premium-Trickle-Double-Glazing-Window/dp/B003CKQP40?th=1
The above is just to show you what they look like. They can be purchased elsewhere for less.
If you are interested in fitting some, take photos of the upper parts of the windows. That said, looking at your's I suspect they can't be but others might be able to give you a definitive answer.