Mould caused by double glazing??

[TiredMum30]

Hi, posting here for traffic.

We have mould in our rented property, had the landlord out before and brickwork needed repointing, a guy came out and did the bare minimum, even I could have done a better and more thorough job then he did, so there's no surprise that the mould still keeps growing.
it's in 3 rooms, the walls and furniture it's growing on are along outside walls. The humidity in the house is ridiculous, so we always have to keep windows open during baths/showers/cooking, and i generally keep them open a little during the day anyway to try and reduce the mould growth.
Anyway the landlord sent another guy around today, this guy said its because this house wasn't built for double glazing! Erm is this correct? Is that what's causing the issue?
There's a tiny plastic vent above the oven in the kitchen and no vent at all in the bathroom upstairs, I feel like these may also be adding to the issue, aswel as the gaps in-between the brickwork outside 🙈
Just checking because I'm going to email the landlord again, because both me and my son have had persistent chest infections earlier this which took multiple courses of antibiotics to clear, so I don't want to get to next winter without the mould being sorted properly.

What is your cooker ? Gas?

We have condensation even with shower fan and cooker hood fan.
But have 4 people in small semi.
Our windows (double glazed) are huge. No trickle vents

Do you put lids on pans?

We have a gas oven but it's been broken for ages, we've had a nightmare trying to get it repaired under warranty but thankfully someone is now coming next week to repair it.
So we tend to stick to meals we can cook in the air fryer, it does kick out some steam though but windows are always open and we keep the kitchen door closed to the dining room to stop the moisture spreading to other rooms, but the mould issue was the same before the oven broke and we bought the air fryer.
We use the hob maybe like once or twice a week if I'm making pasta and we always keep the lid on.
It's not a big house but bigger then our last home and it has really high ceilings, and there's 5 of us, 2 adults and 3 kids.

All furniture is pulled well away from the wall, we learned that fairly quickly once we moved in.

I wasn't sure if the council or environmental health would have a duty to report it to the landlord if we had them round to have a look?

Thank you for the info, I'll have a look through the link and give shelter a try.

@aodirjjd same! I'm in a new build and the humidity in winter drops really low even if I'm keeping all the windows shut tight and drying washing indoors, cooking etc. I do open the window after showering but that's about it in winter - I even close most of the trickle vents. Zero mould ever.

It's a bit much saying people are somehow living wrong in a house for daring to cook, shower, dry their clothes, breathe, not let all their heat out and not run a dehumidifier 24/7.

I think it's better to use a dehumidifier in the winter, rather than trying to ventilate the house by having windows open (obviously do that too, for a few hours a day, just to get a change of air). But when it is cold and damp outside then "ventilation" by having the windows open - I don't see how that can help?

We have more mould in houses now because people are scared to have the heating on because of COL crisis. I'm sure of it.