[Laird Scooby]

Excellent advice already given, don't use the handbrake when it's parked for long periods of time though, engage 1st or reverse (or if it's auto use P instead) and before laying it up, open all the doors, boot/tailgate, bonnet and sunroof and smear silicone grease on the seals.

Let it soak in for 15-20 minutes and gently wipe off the excess, cleaning the mating areas on the bodywork as you go. Also lift the wiper arms off the screens and slide plastic bags or cling film over the blades to prevent them sticking to the glass - some delicately applied silicone lube spray on the blades then wiped off will also help.

Use some silicone spray lube in the door lock barrels and latches to lube and waterproof them. Windo all the windows down and squirt silicone lube into the tops of the rubber channels where the glass slides up and down. Give each a good soaking then "exercise" the windows up and down several times.

Make sure all the drain holes in the sills and doors are clear, likewise the heater air intake plenum under the bonnet (this has separate drains, usually each side on the bulkhead) and also the sunroof drain holes.

When you run it up once or twice a month, run the Air-con for at least 20 minutes each time to help prevent the seals drying out and losing the gas. Also change the engine oil and filter before laying it up and if it's due, the antifreeze as well.