Thank you very much for your reply. So, if I was to make the products available in Europe, do I need to do anything? As I mentioned before, the print-on-demand company handles the production and shipping. And, they have production hubs in the UK, Europe and the USA.
Or, do I simply just create the designs, then upload the designs onto the merchandise and then as the print-on-demand company handles all the production and shipping, I just then have the keep records of my earnings and then sub a self assessment once I earn over the £1000?