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In the UK, we are recommended to reduce carbon footprint by using less gas.
We also need to reduce our Co2 by insulating our homes.

But if we insulate our homes to achieve this goal, one common result is that humidity levels increase in winter, something that again the government would want to keep low.

As in this article: How to check for humidity in the house | Ideal Home
it outlines how important it is to keep a humidity of 60 or below, by opening doors, windows and so on.

This is easy to do, and as an example, a winter day in the UK will be typically 5-10 degrees celsius.
At this point, the home will simply get very cold as the wind blows in 5-10 temps, and as most homes in UK use gas, gas will dramatically increase as homeowners try to increase tempts to aceptable levels.

So what is the solution here? Outside of, say, having to purchase £5-10k solar, which may not be possible for a) cannot afford and b) no space to put them.

Thanks.
 

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Run an electric dehumidifier... theres a nuaire one that goes in the loft space and warms incoming air and recirculates. Few hundred quid. Think it's quite cheap to run too.
 

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Exactly, there are lots of systems that do this - so called Heat Recovery Ventilation. They basically move the air around the house and exchange some of it for outdoor air but use a heat exchanger to recover around half of the heat energy. Not ideal, but at least controlled. The difficulty the UK has is that most of our housing stock, including the rubbish built by most of the big companies leaks air like a sieve. The "passivhaus" movement seeks to stop this and other inefficiencies, but only a small number of homes are built to its standards and generally on commissioned or self-builds.

Edit - most Governments are in-hock to the big building companies, hence the strange planning decisions and lack of sensible regulation.
 

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The linked article is full of half truths and fear factors. Ignore is the best advice.

For those looking for more informed advice, check out articles by BRE, read anything by PaasivHaus including whole house ventilation and lastly don't dismiss the Building Standards requirements
 

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Insulate your house to the max and buy a humidity meter. You will not find more than 50% humidity
 
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