I want to send a fan mail to Tom Felton, but never heard any success of TOM using the Troika address. Is it still valid? Will he reply?

Thank you so much!

What address did you use?

Oh, I see. Can IRCs still be used in UK to change for stamps even if they don't sell them anymore?

I'm really sorry for posting again, but I really need help. Anyone knows a rough idea? Thank you!!

Hi! I want to send fan mails to actors in the UK from Singapore but I'm not sure how many IRCs I should put in case they reply with a big poster?