This sounds about right to me.
I regularly wear a US/10.5 (Allen Edmond Park Avenue, etc). My Alden's (Barrie last) is a US/10. My Trickers Keswick's and Bourton's are UK/9.5 (they're part of the Country Collection and run 1/2 size too large).
My next Trickers purchase will not be a part of the Country Collection and I'll be ordering size 10.