So as I've been working on my build something that I've noticed is that parts for self building one's own camper seem to be much easier to obtain in the UK and Australia. There are literally dozens of companies in the UK that sell every part imaginable from cooktops to complete bathroom kits. Much of which is much cheaper than the equivalent available in the US, if you can find the item at all here. My question is why? The UK has a population 1/5 the size of the US why does self building appear to be so big there vs here?