Well I just received a pair of Uetam last loafers (being a reliable US9D). I sized down by half to 8.5UK and the fit is glove-like...snug and comfortable right from the box. I definitely feel an 8UK would be uncomfortable...in fact I don't think I could get my foot in it.
It's a beautifully proportioned last...although it deserves a better name.
This info helps a lot because I was looking at the loafers and I really liked em but not sure of the last. It's not too tight? Because I'm sure it'll stretch and break in comfortably