Having worked with quite a few British yeast cultures that are not available in the United States, I can honestly say that British yeast character without much in the way of esters is a bit of an oxymoron. Characterful, in British terms, means esters often with phenols. Most American brewers would be surprised to learn how many British yeast cultures that did not make it to this continent are POF+. Harvey's is a prime example. There are also British cultures that throw substantial amounts isoamyl acetate. In fact, I am willing to bet that a lot of the yeast flavors we associate with Belgian brewing originated in the British Isles.