Laarbruch - I disagree. The OP should write to the CAA (not the DfT) to give some background to the MOR that should have been completed. A copy of the letter could be sent to the airline as a matter of courtesy. As the airline will have reported this incident, the letter will come as no surprise. Unless of course... I for one would be very upset having to tolerate the drunken raving of a slob for any period of time.
PM
The Department for Transport and Security are part of the problem, certainly in the UK. Fortunately, they have little to do with an an aircraft in flight. I'm sure they are staffed by sober versions of this passenger, or his progeny. Why? A government department should either take security seriously or admit they are just window dressing. The DfT are doing neither. Besides, this happened on an inbound flight to the UK so local law takes precedent.