S2 Kev - my S1 sits for months without being started and she's sound. You also shouldn't just run her up in the garage and switch her off as when she cools you'll get condensation. If you do run her up make sure it's a dry day, no damp in the air and bring her out the garage to do it. Let her warm up then leave her outside with the fresh air to cool down before putting her away. If I start my s1 up that's what I do. You should also on a dry day open the garage door and get some fresh air inside. The damp air needs to be got shot of on a regular basis.

Either pump the tyres up rock hard so they don't flat spot or ideally get a shite set of rims with badgers arse bald tyres for her to sit on. Don't put her on axle stands as the suspension will drop and when you lower the car and drive her again it will squeak like a bastard. Get a CarCoon if you can afford one. Trust me, they work. If you can't get a decent indoor cover and as has been suggested, leave a window open a bit. I leave the rear opening 1/4 open.

When you bring her out after the winter, run her up and change the oil straight away. If you use synthetic it'll be OK but change as good practice. Wouldn't hurt to change the brake fluid as it's hydroscopic (absorbs water) so the pedal feel may well be spongy. As for a full tank of petrol I can see the logic but you wll loose a load due to evaporation anyway. That said, it would help on start up as the more pterol the less sediment in the tank will be dragged up.

Think that's about it for the moment.......