My old mate Massimo used to drive to work, sink enough cans of whatever had the best alcohol units/£, spend the day drunk and (in his mind anyway) be sober enough to drive home. He was not very productive but worked for himself. The reason was his also alcoholic GF was on the wagon and he didn't want to drink in front of her. Thoughtful guy really, but I have to say his reasoning was a little suspect! In the winter I used to drive to work, sit in my car with him while he got drunk and chat. Then at about lunchtime we'd agree that nothing was going to be achieved that day, he'd go for a kip in his car and I'd drive home. He was highly entertaining, if I'd had an in car cam I could have had a hit YouTube channel.
Was that you I saw shuffling along the other day Rich? A piece of rope around your coat waist, carrying two shopping bags (Waitrose naturally) and picking a fight with a tree?