Just spent last night in Biscarrosse-plage and jolly nice it was too. However, this morning as i went to nip to the shops I discovered I had a flat battery. had a look around to see if i had left anything on but all looked clear. Luckily a very nice young german surf dude got the van started (autotrail cheyenne) with his jump leads. He put a meter across the battery and thought the alternator was good. I thought i should head off home as I had no confidence the problem wouldn't return, not that there has been a recurring problem. When I reached home after a 3 hour drive, I parked up, switched off the engine and tried again. It Started! However, when I went to move it an hour later, flat as a proverbial pancake. Not being of a mechanical mind does this suggest, a) the battery is no good and needs replacing b) something more sinister like the alternator packing in Would be grateful for any help.