I like to keep an open mind, and phraseology and instructions that seem completely acceptable and understandable in the calm office environment are not always suitable for "real world" situations. A controller may be absolutely by-the-book......great....pat on the back....utterly blameless; however that is not much good if the end result is a misunderstanding. Let me ask a question; how often in normal day-to-day controlling do we use the phrase " ,,I say again,,"? How often does a pilot [UK or foreign] hear this phrase? Always be willing to consider that something might need changing.