Looking for Meermin sizing help as well. I have a narrow foot and wear:
9.5 Ferragamo Tramezza Burgundy
8.5 E C&J 360 last (Malton) (slightly too wide) Chestnut
9.5 C (narrow) Peal & Co (C&J 240 last) Tan
9/9.5 D (narrow) Edward Green 82 Last Black
The guys at the Armoury reccomended that I order an 8.5 UK in the simpson last.
E-mailed Meermin and got a response from Luisa that I should order a 9 UK in the New Ray last(their narrowest).
What do you guys think? I read through the thread and several suggested they took the same size in the new ray as they did in the simpson...so Im not sure.