Hi
I took the S4 out the garage a couple of weeks ago to get ready for the summer, it started fine (after charging the battery) and I let it tick over for 20 mins outside, no issues.
I then jumped in to drive back into the garage and it stalled. It hasn't started since

. The car has always started first time. I thought it maybe fuel as I didn't know how much was in there, so I put 2 litres in and it still only turns over. Now this is like when I haven't switched the immobiliser off, but as the keys died a long time ago and I didn't seem to need them for ages, I thought maybe it had 'repaired' itself. So, I bought new batteries but still the car just turns over and doesn't fire.
Any ideas? If it is fuel, have I put in enough to rule this out?
I know very little mechanically but need to get it to the garage for it's service and mot - what a pain.
Anyway, if they're are any common issues I'd be glad to hear.