PantaI have 11 medium width in J.Fitzpatrick too, and they are a little bit snug in the toe box area. I can fee some discomfort after prolonged wear. I don't think I can wear anything tighter/narrower. A hint more relaxed would be preferable. Can you tell me what your 11 will be like ?
fink.nottleBased on that I would tell you a size 11UK would be appropriate but again, I can't speak on the toebox relative to Fitzpatrick. I can tell you that I have not had an exchange/return due to the toebox being tight and this is a classic almond shaped last, styled after English shoes which are generally more forgiving than Italian styled elongated lasts which tend to have less space in the toe box. I am offering exchanges on the shoes for sizing issues (no refunds though).