Ive a collection of cars which most ive had decades and most get stored for extended periods of a minimum of 4 months over winter.
From experience Don't cover it. It can leed to micro blistering of the paint. Been there paid the price for full respray!
If in a garage.
Put extra pressure in tyres to reduce chance of flat spots.
Use a Battery conditioner to keep all electronics fully working on modern cars.
Open one of the windows slightly to allow fresh air in or it will go moldy inside.
Park in gear and leave handbrake off.
Thats all thats really needed. Most go way ott.
As an example neither of my GTIs have moved since 17th March. 
Harry Metcalf of harrys garage on youtube had a video on this not long ago.
https://youtu.be/cImhs_uwrAU
Yeah the cover or not to cover seems 50/50 across various sites/forums. Thanks for the warning on paint work, that's sold it to me that I shouldn't cover it! I'm planning on leaving it away from trees and giving it a good wax/seal before I leave, will this be ok or is there anything more worth doing to protect the paint work? It's white if that makes a difference?
Can't get it in a garage annoyingly, as that does seem like the golden solution! Hopefully the gel packs suggestion will stop the mold as suggested by Carbon VW.
I've a DSG and electronic handbrake... so can't leave in gear unfortunatley and possibly can't even leave handbrake off!
Handy video thanks, but again based on classics and storing inside... what I'd give to have a bigger garage now!!!