Not sure - mine could fail to start anytime - hot, cold etc. but it was a very occasional issue.
Re not using the car. I bought it new having saved for quite some time. Circumstances changed, got a company car, couldn't bring myself to sell the Golf. I thought should my employment circumstances change, I would need the car and regret selling it. Then I bought an old Series 3 Land Rover and started a restoration project with that. The Golf sat in the garage under fleece blankets but I made sure it was started and occasionally run.
It's starting to get a little more use now as it's often kept not the drive and I reckon it will do about 500 miles a year from now on. Great car, still like it and it still smells new inside
I buy the 2 year service packages from VW. I usually get a phone call a week or two later questioning the mileage given is correct! She'll keep.....I hope to retire in 16 years heehee.