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Wood swells and shrinks in response to moisture content changes, so a perfecly accuratly cut hole will change size. Bad idea basically. (sealants do not stop moisture change from atmospheric conditions, just short term exposure (such as spillages)).

We are going round in circles. Vent's vent, they are made to vent, vents = draughts. No vents = Mould. Unless you dry the air by other means (dehumidifyer) or reduce cold surfaces (upgrade insulation).

that would be a 30mm airspace rather than a cavity per say (it is not vented or drained anywhere, therefore it does nothing usefull). You need to find out what that black membrane is, as said, if it is breathable then you should not have a condensation problem, may as well full fill. (if it is...

Water penetration does not typically occur through rendar, but round it. For instance seals between rendar and window frames, or pipes and such. As long as the rendar, and what the render is on is more breathable than the vapour control layers on the inside you should avoid condensation (rule...

The external insulated rendar will provide another weatherproofing layer, ensure that openings are properly sealed and maintained (like seals around window frames). Loose polystyrene beads will fit, and should not cause an issue of moisture bridging as they allow some drainage. At the very...

Old type buildings like that lost a lot of heat through the wall, which helped keep things dry. So you need to ensure the external rendar is waterproof. Condensation isnt a concern as foil faced foam and vapour layers will make it better, small perforations have not shown to be a concern.

That will stop or reduce wind blowing through, but vents are designs to....vent. And reducing the air flow may increase condensation forming on poorly insulated walls/windows. Condensation on walls = mould (condensation on windows is just a ballache) The alternative is to make the place more...

But why do you think the basement is a source of damp? And if this area has damp/high humidity air, it needs to be vented out somwhere, or the source of damp eliminated. From the information provided it is not an issue of high humidity (again looking at current external conditions), but low...

Without spending decent money or effort to stop condensation risks you will need that ventilation. A mechanical fan will allow you to choose where the droughts occur. Blow into the house (lofty systems) = the fan itself and the room you put it into. Blow out of the house, and it will suck...

All good. You will need to insulated the cavity as well though, or air movement inside the cavity can have a big impact.,

Water penetration is a separate issue (and is site specific), but have a good look at the general state of seals around windows/wall penetrations etc. Personally would recommend insulated plasterboard as an easy option. Insulated render outside is a bit more costly, but helps if you don't want...

This is an age of equality, and ageism is frowned upon. So she can be quite happily be branded as a horrible busybody bully, being old is no excuse.

If the walls are brick/block cavity then polystyrene beads are pretty safe. Cavity wall insulation for brick/block is mostly safe except for high exposure areas where you get lots of wind driven rain. Timber frame should not have cavity insulation.

And? I can't see how it matters whether it is a positive pressure system, or if existing fans are increased in capacity or frequency of use. Air changes are air changes. Personally I would go with a desiccant dehumidifier rather than more air changes, will dry the air a bit as well as...

Trolling belongs in GD noseall.

This is your problem. Stone is cold, such houses used to have roaring fires and very high amounts of airflow which helped to prevent such condensation. In the short term increase ventilation, and increase heat output (those energy companies need your help making money!). Long term seriously...

That is more for winter. Outside temperatures will be colder, so outside air will hold less moisture, at this time of year replacing inside air for outside air won't bring the humidity down. As woody says, it is more important to consider why condensation is happening. Cold surfaces are bad...

What he has done is the right method, just sloppy sloppy sloppy. Decent quality plywood. I suspect those battens screwed onto the back are to restrain warp, decent quality plywood at that size should be self flat. I suspect the opening is not perfectly square, so I would cut it to size with...

Which is it, that people can't afford the mortgages or rent, or people can't find housing to buy/rent. It is a pricing crises. Wave a magic wand, plop half a million homes around in the south east/london, those homes would still be sold at a far higher than some people can afford.

Which words do you not understand. I don't think anyone here can teach you how to understand a collection of words as a sentence though internet posts, does not mean it makes no sense. Maybe there is an elementary school nearby that can help?