I'm eyeing these scotchgrain C&J ghillies sold by the French company Upper Shoes.

I'm an average US 10.5 & have so far been a UK 9.5 in all of the mid-priced RTW English shoes I've bought (e.g. AS, Cheaney, etc.). My only euro-size footwear are sandals (Birkenstock & Mephisto), all in 44. The Upper Shoes website shows 44 as the equivalent of UK 10. Can anyone comment on that conversion? Should I see if they can order a 43.5, or take my chances on the 44?