Hi everyone, I live in the UK but i need to send some SAE which will require me to put Spanish postage on the return envelope, upto 20g which is basically letter size! Anyone have any ideas how I could purchase these stamps? Or how much approx the postage would be? Any help would be greatly appreciated! Thanks

I don't know exactly how it works, but the post office should be able to sell you something that will work as return postage on international letters. I did it once back in the US, I think.

I would ask at your post office. They have to have something for you.