DH met his best friend for drinks on Sunday afternoon. As we pulled into the pub car park we spotted his friend's car parked. When I picked up DH 4 hours later I spotted his friend's car hurtling down the road towards his house. I had my baby and toddler in the car so was absolutely livid that I came so near to a drink driver with my precious babies in the car. DH's friend had told DH his taxi had arrived and they had both had quite a lot to drink in that time. I've sent the friend a snotty message (no reply) and since driven past to make a note of his car registration. What do I do next? Should I do anything else? I'm not sure when he will be going to that pub again but I am convinced that he will do it again as it's only a mile from his home. He lives with his mum (he's 41), do I ring and tell her?