This winter the car has been in the garage again, but this year hooked up to a battery conditioner. All has been fine.
The Mk2 is also garaged. I've just taken the leads off the battery on that one and every time I've connected them back up to start it, it's fired straight away. Take the battery off the Mk6 and you get a multitude of beeps, bongs and warning lights the first time you start that. A quick spin down the road sorts all that out, but it kind of defeats the object of keeping it off the sh1ty roads during winter.