Hi Hill,
Possibly which British lady should read from the French whom have a claiming "live in your means". This simply signifies people should reside a sustainable way of life considering one's finances.
Because she meant to dine in a "posh" eatery then she should expect a huge bill to go with the experience. Furthermore, she shouldn't expect to order inexpensive beverage since well. If she would like to go on the inexpensive then she should have dined within the nearest McDonald's.
Furthermore, I believe the "posh" eatery is simply trying to generally be throughout the safe side. Naturally, tap within the UK can be better for consuming than inside the Philippines; however, maybe the restaurant finds it safer to offer bottled liquid.