Never had a problem
But after a major service (everything incl cam belt etc)
And sat in my garage (with battery charger 24/7) for 3 weeks over xmas/ny...
Day 1
Took for a spin - no probs.
Parked up for petrol - filled up...
...started it up and it wouldnt turn?!!!
Tried a few times, it tries to start but just wouldnt turn over.
Over a course of 5mins, try, wait, try and it started.
Day 3
Went to work - no probs.
Drove to lunch - no probs.
Fill up at garage - sat there trying to turn for 5mins again

Any suggestions?
Cheers