Whilst others claim to make handmade clogs, the clog soles are machine cut, in part at least, limiting true customisation. English clogs were always part wood part leather, the dictionary definition being "a composite of wood & leather". I was taught by a man who was taught by a man who was taught by a man. In other words I'm of a line stretching back centuries. In turn I have taught a welshman, only fair since I too learnt from a welshman. Whilst there are certain styles pertaining to each country, a great many styles are common to both. The English tended to carve welsh and west country alder, scottish birch and lincolnshire willow. The Welsh used alder, birch & sycamore. It was said that they paid more for sycamore. I've found it to last much longer. Cherry is also surprisingly durable and stable.