Thanks for the advice.
I can give them the address, the make, model and numberplate of the car (Its not exactly inconspicuous) and the times (Normally Friday/Sat/Sunday evening) when they are driving about. Both of them do it, i have heard him shouting at her on sat/sun morning as she is on her "cocain comedown". I am actually pretty sure that he is almost always drunk and gets a lift to work because of it but still drives about at the weekend. I often hear them binning all their bottles in the recycling. A couple of years ago i had someone come over to cut the trees down and the gardener came over to me a short while later and said is he always like that as he reeked of booze and could hardly stand, got in his car and drove off he was going to call the police but he would 100% have known who it was and as he was there most of the day would probably have had a go at me.
They are both aggressive, drunk/drugged scumbags who have no respect for the law or the other residents and his "hard man who will take anyone on even coppers" attitude has come close to getting someone killed already and will probably if he isnt took off the road...