Leather Double Buckle Sandals

This seems a good shoe: soft attractive leather, cork sole and buckles rather than velco (me not being a toddler). Unfortunately its small, a good inch shorter than any of the other size 11 shoes I own (including a number from M&S). If I can swap it for a 12 it will be fine, if not it'll have to be retruned. As I haven't worn it yet, I don't know if it is a viable shoe, but based on its appearance and quality I might recommend the shoe but with the proviso that the get a size larger than they usually buy. When I bought it, there were no reviews. Buying in a shop, size is less of a problem as you can see the product and even try it on but getting things on line is increasingly becoming an act of faith, especially with M&S.