Learn to queue (stand in line) politely. On the odd occasion when someone has the unmitigated gall to queue-jump, react with a stiffening of the spine, elevation of chin, and a steely-eyed stare rather than verbal abuse (although this may be rural/semi-rural; urbanites may perhaps be more vocal?)

If you're staying in a B&B and someone asks Your Beloved what time she wants to get knocked up in the morning ... it isn't what you think.

What I'd call 'hikers' back home seem to called 'ramblers' or 'walkers' in Britain.

Enunciate.

Buy rounds.

Understand that you're never going to win the graham cracker/ digestive debate. Never.

sian