How to stop condensation in a garage?

[dnb]

I have a 1960s built garage - the ones with concrete block walls and an asbestos roof. In the winter it seems to make lots of condensation which makes it damp and be a generally unpleasant place to store my TVR.

Is there anything I can easily do to stop this happening? There are plenty of holes for air to circulate so I'm surprised it's quite so bad. There is no easy access to permanant electricity at the moment.

Thanks

[RobboC]

Not really as a Dehumidifier would be full in about 2minutes.

I used to have one and hated it, think you're better off with the car outside as the air can circulate!

[dnb]

It would normally be outside enjoying the fresh air. However it's sat on 4 axle stands with lots of parts missing at the moment so I would prefer it to be out of sight.