I struggle with this too... I go to alot of places on my own, but feel very uneasy leaving my laptop unattended... So I always have to take my bag with me to the bar or toilet or wherever...! I remember a certain occasion where I left my bag on the seat next to me in G, G being the quiet carriage, i took a phonecall in the vestibule. There was a women who didn't have a First Class ticket in the b***dy first place, that despite quite clearly being able to see me between G & F, decided to go to the buffet and report my bag unattended...!
On the 2 4 1 side of the fence, although not related, when me and my friend go to a certain nightclub, they offer 2 for 1 drinks... But refuse to serve you just one drink should you only want one...! Not great for somebody who drinks mainly lemonade, has a very small bladder and there being a distinct lack of open loo's about at closing time
As another aspect to this, What really gets on my t*ts is when my friend can buy a half pint of Strongbow for ^1.20 and get one free... I get charged ^2.00 for a half pint of Lemonade
Yes I get one free too but much for encouraging sensible drinking...............! Grrr!