TDKmk2 - why I have to be VERY careful how I respond to your question I have no idea, I suppose a very simplistic, broad definition might be along the lines of "pilots living in britain" as opposed to the economic opportunists who breeze in when the going is good.
Captain Stable's point about foreign pilots being allowed to have favourable FTL's to allow them to make a mockery of our tax system is just as bad as flagging out whilst we have guys on the dole here.
P.S. Is there such a thing as an experienced sciolist??