Here are some C&J Islays / Harry in a 10.5F UK from Rogerson's footwear in Scotland. I bought the Lindricks and despite these being the most comfortable boots I own, these have been sitting in my closet since.
These have the same exact specs as the stock islays except that these are on the 228 last (same last as the C&J snowdons). If you're a wider foot gentleman these are for you.
For reference I am 11D US in the Lindricks, 10.5 E / 11 D on Alden...