I was in the Post Office yesterday and forgot to ask... and the Royal Mail website doesn't answer my question (no surprise there!).
I have some thin items e.g. sew on patches, which are currently listed on eBay for UK P&P only that I would like to change to include P&P to the EU and USA. In an envelope they would fall into the size and weight range for International letters, but can I post them as such if they are not letters? I can't see that information anywhere. I know that a UK letter doesn't actually have to be a letter, but Airmail letters did in the past. Has anyone posted thin items abroad since the last round of Royal Mail changes?