Little bedroom's ceiling is infested with moulds

Hi John,
Thank you. This small bedroom upstairs is at the back of the terraced house and is just above our kitchen on the ground floor. As far as we know, when we had our loft insulation done few years ago, it did not include the one in the third bedroom as there is no loft hatch in there as the ceiling is all sealed.
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I think the third bedroom has a separate loft space which we cannot access without first making a hatch area in the ceiling.
Also, as the property was built in the 1890's, the 2 external walls seem to be made out of single layer 'stone' with a metre double-grazed upvc window which has no tickle vents at all.
I have now removed all the moulds off ceiling and walls several times and painted with 2 coats of anti-mould white matt paint (Blackfriars). I bought another can today and intend of having 2 more coats just in case.
I sleep in this little bedroom with the door slightly ajar and I dont get any condensation in Window at all in the morning and walls look very dry.
The moulds formed because of our previous tenants eating hot foods and drying wet clothes on a 70cm radiator (single panel). We are thinking of having this radiator changed to double-panel 1-metre one.
I will also get someone in to cut a hatch hole in the ceiling and have it insulated properly just like the rest of the house. Alternatively, I could have a false ceiling using Kingspan insulated materials and eventually either have those 2 external walls insulated outside as there are no cavities at all or, I can have them covered with uPVC sheets inside. I don't like to have these walls insulated inside as this will make the room a lot smaller. Current size is approx 3.2m x 2.8m.
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if you think youve taken away the mould and stopped the actions that caused the mould, then it shouldnt come back
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Thanks. Would you say applying 1mm PVC sheets on 2 external adjacent walls would help?

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