I was at school with two guys who were involved in dodgy incidents such as these. One guy got a 5 year ban, £3000 fine and 300 hours community service for causing an injury and writing off three cars in a drunken frenzy. Absolute tool. But hes now served 3 years of that ban (was only 17 when it happened), and hes undoubtedly learnt his lesson - if anyone else contemplates driving after any drink he doesnt let them do it and puts them off. Following the incident his family threw him out he house. But he is a decent guy, just made a big mistake.
But the other guy was at a party and pissed, had not passed his test, nor was he insured, and asked my mate if he could go out to his car to get some more beers that he had left stashed there, so the other guy gave him the keys. But instead of just taking the beer, he decided to "borrow" the car (without the owners knowledge), and he ended up rolling it in a ditch! the police breathalysed him and he was over the limit. They took him into the station where he took the second test, and miraculously he passed it (everyone else had seen him drink easily 15-20 units before he took the car). But he still had no licence or insurance. In the end, my mate ended up saying that hed given him permission to take the car and all charges were dropped (even driving without a licence/insurance), all he had to do was pay my mate back for the car he took, and he got 6 points on his provisional.
So the no licence/no insurance bit may not be that serious, but the drink driving will be a ban.