DP and I had a stupid row which turned into a loud and heated argument late at night last weekend. Slamming doors and shouting, police were called by a neighbour. This has never happened before. We have always been able to resolve disagreements relatively calmly and both agree this must never happen again. He is devastated about how he behaved and how much he upset me, and I feel the same. We'd both consumed alcohol, him more than me but neither of us drunk. He went outside into the garden at my insistence to get some air and calm down. It was lashing down with rain, very windy and he took shelter in his car which was parked directly in front of our house on a private lane. The alarm kept sounding so he sat in the driver's seat and put the key in the ignition to disable it but didn't switch on the engine. The vehicle maker's app on his phone connected to the car shows a record of the alarm sounding and what time. He then texted me to say he was extremely sorry, that the car alarm kept going off, he couldn't legally drive anywhere, and could he come into the house to sleep on the sofa in our lounge. I wasn't able to reply, that is the exact moment when the police arrived. He was breathalysed and found to be just above the limit. They arrested him and have charged him with being drunk in charge of a vehicle. My understanding of this is that there must be a reasonable belief the person intends to drive, is that correct? He categorically was not going to drive the car, he was preparing to come back into the house and would never have put himself or other people at risk. I told this to the officers as did he but they seemed uninterested. It seems ludicrous that for a few brief moments sheltering from awful weather in the car, cooling off after an argument and asking me if he come back in, as he said in his messages, turning off the car alarm they have concluded he was intending to drive. Is it worth trying to defend this? Local solicitors are quoting £2,400 to do so. We are terrified he'll lose his license which would make work/family life very hard, and that a record will cause issues at work, the nature of which means he has to have special security clearances.