Between 1984 and 1985, automates sold stamps which value was printed on demand of the user, in some post offices. The stamp was one like this one:
Queen Elizabeth II's profile is the one used on British commemorative stamps, designed by Arnold Machin from his definitive serie effigy.
There is no machine stamps in this country. This may explain why philatelists are fearing the postage meter, called Horizon labels : available since 2002, they are blank piece of paper with just enough printed intels to post a mail (value, brand, date, number of the printing counter).
Stamp Magazine of January 2008 announced that a new design will be inaugurated in the first weeks of 2008, including a graphic element for security purpose. May the British have better than pale yellow on pale blue design...