Simon, I enjoyed your posts and your time on the forum was cut too short by an unfortunate decision. Sometimes that's all it takes - one bad decision. I've made plenty in my lifetime and got lucky that most of them didn't ruin my life completely, etc. There's a lot of finger wagging in this thread and I doubt all of those fingers are attached to saints.
Enjoy the new car and fresh perspective on life. DEFINITELY lawyer up, assuming this is your first such incident it's worth trying to get it brushed away in lieu of hefty fines and/or other plea. First time offense that didn't seriously injure/kill anyone shouldn't ruin your life. Also, there's a difference between doing something stupid and something intentionally negligent. You clearly didn't set out that night to crash your car, so it's a shit happens situation. Beat yourself with a feather, welcome to being human.
Fwiw, the fact the blood test wasn't definitive the day of the incident and had to be 'sent away' leaves a lot of room for the lawyer to cast reasonable doubt. I'd expect, in the hands of a qualified defense lawyer, the charges to get reduced or tossed out altogether.
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