Elizabeth David, in her wonderful 1977 classic English Bread and Yeast Cookery devotes quite a section to the making and baking of crumpets.  She concludes this with the following vital information:

As a last word on the common present-day usage of the word crumpet, I quote Philip Oakes writing in the Sunday Times of 6 October 1974. (His words may be useful to future students of slang.)  The subject is a play called The Great Caper by Ken Campbell.  The play, the author told Philip Oakes, “locates the crumpetstrassen of the world; thoroughfares where beautiful women can always be found . . . In London, King’s Road Chelsea is the crumpetstrasse of note.  In Munich it’s the Leopoldstrasse; in rome via Botteghe Oscure . . . In Copenhagen you should try yur luck on the Hans Christian Andersen Boulevard.”

Mr Campbell, added Philip Oakes, was not recommending pick-up points; he explained that the interest is purely aesthetic.