Some pubs take meal orders at the bar, others have separate food counters. However, drinks must almost always be purchased at the bar. To the natives, round-buying is sacred. Pubs change according to the time of day. The quiet, pretty town-centre 'tourist' pub you discovered at lunchtime may become a vibrant, crowded young people's pub at night.
Pubs generally open until midnight in Scotland.
Toilets in pubs are for the use of customers, not the general public. The pub, to many natives, is a second home - and some probably spend more time there than they do in their own homes. There are few restrictions on what you can talk about - pub etiquette is concerned with the form of your conversation, not the content. Pub regulars will often start an argument about anything, just for the fun of it. Arguments follow a strict code of etiquette based on the First Commandment of pub law - Thou shalt not take things too seriously.