For reference, I wear Trickers last W4444 7UK, W4497 7.5UK, Alden Barrie 8US, Common Projects 41, and MMM GATs 42.
Sizing Guide: I should have went with the same size as W4497 in 7.5 UK. I could keep the 8UK but would have to put in an insole which I prefer not to do. There is slight heel slip and a little more room in the toebox than I prefer. This felt a touch larger than Alden’s Barrie in size 8US.