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Thanks for the answers so far. Fredpuli47 - no, it isn't part of a bigger scenario - he was travelling home (alone) and ended up at a roundabout getting out of the car because the car behind was flashing him. (The car behind had pulled out in front of him cauing him to slam his breaks on so he had his hand on the horn and had to swerve to avoid, when they got to the roundabout he was in the outside lane again because he was going straight on, he stopped at the roundabout and the car behind flashed, so he got out - stupid I know but he certainly wasn't looking for a fight). He was talking to the lady driving when the man in the passenger seat came out and round and grabbed him by the throat. First time he managed to back off and step back, man did it again, he couldn't get out of it, so he hit him, once. Unfortunatley he saw one witness statement at the Police station which had lied saying he was hammering and banging on the car etc. We are hoping they will have taken forensics or something off the car to prove he didn't touch it and there was a man in a car behind who stopped - we are hoping they have taken a witness statement off him which will then say the same as my husband's.
Thanks for the reassurance - also 7 months pregnant (me, not husband obviously) so very stressful when this whole type of thing is completely alien to us.