Hello, I have a few questions regarding to sending a fan letter to London. 1) Can I use first class UK stamp? Does it have to be worldwide stamp to send from London to the US? 2) Where can I buy UK stamps in the US? IRC is not allowed in the agency I want to send to. 3)Usually how much postage shoul...

I had tried Royal Mail Print&drop but apparently the label expired soon in a month and I don`t think I will get a response that soon in a month...
Any suggestions? The agency had declared that they don`t take IRC..

Good day!

I have Gal Gadot autographed photo, Taylor Swift signed CD cover, or Millie Bobby Brown signed photo and I would like to exchange for Emilia Clarke`s autograph.
Please inbox me for detail