My garage shares a wall with the house but that's the only "heat" source it has, though the room on the other side of that is my study and is rarely heated. Though I concede the amount of computer crap and other gadgets generate their own micro-climate. The only insulation is in the 2 GRP double skinned electric doors and the only proper sealing is all around those doors. There's vents in the eaves (some by design and some from the sh!t builders), daylight around the side door in places, and it's a bare concrete floor. But still not a drop of moisture anywhere; evidenced by some of my tools and other bits and pieces that show no signs of any kind of corrosion, despite no chrome or other coating and especially no care from me (most of my tools live on the floor where I throw them, until a bi-annual tidy up). My TAT oil filter tools corroded more in the house from me handling it, than it has done since moving out to the garage.
The car has spent 6 years in there and hasn't dissolved yet.
Maybe Bedford's temperate climate is so static that there are no temperature extremes or changes in relative humidity and there's just enough humidity to keep leather supple but not turn it into a rotten mess of mildew or the equivalent of hardboard.
Yeah of course, you barely see it on tools or on the car (which of course as anti corrision everywhere), but for exemple last weekend in the garage I saw my two Hans devices started to show some fungus on its pads...
In the same time, the alcantara seats in the mk1 111s which where catastrophic on this last year in the garage, are now perfect in the Carcoons.
My opinion of the word has transfered to the object 
Aimy, please take your car out for a drive - I could add some miles if you don't have the time 
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