Playing with my Bartender's Choice app, I made the Archangel cocktail a couple of nights ago, not realizing at first that I had already made it on the PDT thread (the recipe is identical to the PDT book, except for the absence of lemon twist). This time I used the gin specified in the recipe, which is Plymouth.
Gin, aperol, muddled cucumber.
The Bartender's Choice app describes the drink as a Negroni-influenced Martini, which is an accurate description.