Drunk driver doing a runner from an accident

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So my Jeep and a few other cars were totalled over the weekend by a drunk driver who then legged it and evaded the police for a day or so, only to call them when all sobered up (that's the concise version).

What will the likely punishment be for this? he would have failed the breath test, was slurring words etc, but is now apparently stating "he fell asleep" rather than was drunk. Do the courts assume the worst if someone does a runner from the scene or is it a good way to avoid losing your licence if drunk??

ta

[scrw.]

Stunk of booze, was seen drinking in a local pub for a few hours before the crash, slurring words, I am sure a good lawyer would have the latter as a bang on the head though. (un)Fortunately the CCTV system in the pub he was drinking in has been sent away to be repaired, I understand the police asked to see it.

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I should add the police are well aware he was steaming, they were searching for him for a few hours with a dog & drone team but he was hiding up somewhere in a mates house we think. Will go into full details after any court case if it gets that far.