Pub tourism is one of my favorite ways to spend a day in London. The pub "density" isn't all it's cracked up to be. To be able to make it to the next pub for a bathroom (and to preserve my ability to walk) I've found half pints to be ideal. Ideally, accompanied here and there by pub food.
Bar staff don't universally view half pint orders with respect.
Bar staff don't universally view half pint orders with respect.