Here are some general tips for storing any car from a motoring journalist.
Have the oil and filter changed. Make sure the coolant corrosion inhibitors have not degraded (they usually have after 3 - 4 years, so have the coolant changed). If the car has ABS, make sure the brake fluid has been changed within the past two years or the ABS pump could suffer internal corrosion from moisture absorbed by the fluid. Clean and polish the car. Take it for a reasonable length dry run to thorougly heat through all systems and evaporate off any condensation. Overpressure the tyres to 40+psi help prevent them flatspotting, then put it in the garage still hot from the run. Connect up to a trickle charger which monitors the battery and keeps it to a constant 13.5 volts without damaging the electronics. Leave one window open a crack to keep the interior ventilated, but not open enough to allow mice to get in. Cover with a cotton sheet.
Trickle chargers from www.international-tool.co.uk; www.hamiltonclassic.co.uk; www.ctek.com www.toolconnection.co.uk; www.airflow-uk.com, www.carparts-direct.co.uk
Car storage specialists www.carbank.co.uk; www.classicarstorage.co.uk; www.classic-reserve.co.uk; www.northerncarstorage.co.uk; www.premiervehiclestorage.co.uk