This CR list post regarding the merits, or lack of, Dawes frames made me wonder about fakes:

"Hanging in the workshop of frame builder and enameller Rick Powell for many
years, and as far as I know still there, was a very drab and dusty Dawes
frame. When I eventually asked him who it belonged to, and why it was still
there, he pulled from the seat tube and gave me a hand written note, which I
still have. The frame was left for Rick one day when he wasn't there, and
the owner left the note with it to tell Rick what needed to be done. It
reads: Dawes, remove head badge, convert to curly, fit lamp bracket, gear
hanger, and tangs to forks. Red flam. Harry Butler.

Needless to say Rick would have nothing to do with it (or any other of
Harry's forgeries) and is still waiting for it to be collected. So obviously
there was one man at least who thought a Dawes was well enough made to pass
as a Hetchins. If anyone is interest in acquiring a Dawes Nearly Hetchins
model I can enquire for them."

Seems H. Butler wasn't overly concerned with hiding his methods, or even doing his dirty work himself.