I'm wondering if at least the latter part of Corrie's wandering may be him trying to find a lift home? I don't know how food is sorted out at the base, but what if he hadn't eaten and knew he had nothing to eat at the base. So he buys loads of food, eyes bigger than belly or he felt a bit rough due to the amount of alcohol he's consumed, which could explain giving the food away and having a sleep. He wakes up and wants to go home. I don't know why he didn't call his friends, did he think they'd be back at the base already? He's lived there for several years and it seemed lots of people knew him, and presumably he knew a lot of people. The horseshoe had apparently very little traffic - just 3 vehicles and the bin lorry, but could it be where someone he knows parks whilst at work and that person should finish work soon? When Corrie looks up the road twice, could he think it's a/the person who may give him a lift at least part way home? What if that person didn't turn up but another car was there, maybe a bit iffy and they're not happy when they realise Corrie is hanging around, maybe sitting down against a wall, waiting. They ask him what he's doing, he mentions a lift back to base. If the people are iffy being seen by a soldier is not good. Maybe they think he's more likely to report what he's seen. Could they offer him a lift, except there's no room in the car. Corrie may suggest the boot, if he wants to get back for his dog. In he gets, the iffy people aren't sure what to do with him. They get to the middle of nowhere and decide to ditch him. He's so drunk he'll have forgotten by the morning. They open the boot and he's suffocated. They dump him, but it could be anywhere, though certainly remote.