I took a gamble as they were on sale with no returns haha.
I emailed Mike about the pair that were available in UK 9/US 10. Told him I wear the following:
In Carmina Salinger double monks I'm a 10
In the Alden for Epaulet Natural Chromexcel Longwing I'm a 10.5
In Allen Edmonds Strand I'm an 11
In Chucks I'm a 10.5
He said that most guys take the same size in the Inca and the Forest last, and would drop a full size from the AE Strand.
They do fit and are a touch snug but I suspect they'll break in nice once they soften up. The leather is so nice.