Lakeland ActiveMen's Silloth Lightweight Ventilated Clogs

My friend is a size 11, but bought other unbranded garden clogs in a size 10 fitted okay, he found 11 abit big. So should I buy a 11? or risk a 10

where are these shoes made?

My son has wide fit. Do you need to order a size bigger or will they accommodate getting his current size?