If you are in the UK and would like to trade on Amazon, you can get a UPC by registering with GS1 UK. GS1 UK…
How do I get a UPC?
EAN
EAN is short for European Article Number, which is a unique ID that may be ascribed to products in the EU. These identities may be used in product feeds, for example in Google Shopping, this can be used as the GTIN, instead of a UPC.