No source: Rabbit Reproductions Type foundry/GargoyleRR Bold
Might have migrated to Red Rooster.

Might have migrated to Red Rooster.

So it seems:
http://www.myfonts.com/fonts/redrooster/gargoyle-rr/

OPTI fonts also used to have Gargoyle

A Steve Jackaman digitization based on an Adrian Williams design from the mid 1970s, which is derived from a typeface called Brook Type, designed by Lucien Pissaro --son of the painter Camille Pissarro -- for his private press (Eragny Press) in 1903. The design is in a style called Venetian.
Don

Thanks everyone !