I had a car parked up for several years (because I couldn't afford to run it). The tyres didn't look too good but the mate I gave the car away to pumped them up and found that they were fine.
I also used to be a 'trade plater', collecting and delivering cars all around the country. I collected quite a few that had been stood for many months, or even years. The biggest problem was usually getting the handbrake off but, once I'd got the car started, a bit of alternately revving it in first gear and in reverse gear nearly always did the trick. (There was only one vehicle I couldn't get the brakes off). Even getting the car started wasn't usually much of a problem. A simple jump start was often all that was needed. (That car of my own, which had been standing for years, was a diesel Citroen BX. It started first time on a jump start and my friend reported that the battery was still as good as new).
If a car has been garaged in dry conditions, I reckon that the most you'd need to spend would be �200, to cover the cost of 4 cheap tyres and a new battery. With luck, you might not have to spend a single euro!)
Chris