I have to say my first thoughts went to cocaine. I know people on here are saying we shouldn't speculate but I personaly put the pieces together...the rubbing hands...the leaving and walking up and down etc. And it lead me to thinking it looks like someone scoring drugs.
I am in no way saying this in any way to put down Anthony's character...we have no idea why he left. But it does help to think of different scenarios and this one for me fit the pieces together best.
Only his family and friends would know if this is the case.
I only thought of this as someone who lives in London, it is EXTREMELY common for people to take cocaine on a night out. All types of people, working class, upper class, doesn't matter.
We are all just trying to figure out WHY he left the pub as this is probably the key. Otherwise if he left to simply go home I pretty sure he would have said goodbye to his colleagues. I know people talk about peer pressure but he is a full grown man with children at home, I'm sure he wouldn't have been too pressured to stay.
I hope he is found soon as it must be just awful for his family and friends.