I like the version of the bar Le Lion. They switched the Dry Gin for Old Simon Genever, the vermouth for Noilly Prat Rouge an 1,5 cl, same amount of Bebo.
Made this with. 1 1/2 cl coffee liqueur due to a comment about it being too subtle. It wasn't subtle at all! (I used Galliano ristretto). The coffee arrives on the palate late and prominently along with the bitterness. I think Diffords measuments would strike the best balance. Nice drink, although a bit sweet and doesn't beat a regular negroni.