Yes IRC's are the way to go- can be hard to locate but your best bet is to start with your largest Post Office.
IRC's have a huge redemption value in Australia so you only need one

And sometimes the actor will pay postage and send it back so you can use for someone else ("Susan" returned mine but "Paul" didn't).
Simply take your completed request (letter, SAE, IRC all in one envelope) to the Post Office and have them weigh it for you. I'd be surprised if it came in under 10g so the 20g price is £1.10

Yes IRC's are the way to go- can be hard to locate but your best bet is to start with your largest Post Office.
IRC's have a huge redemption value in Australia so you only need one {up} And sometimes the actor will pay postage and send it back so you can use for someone else ("Susan" returned mine but "Paul" didn't).
Simply take your completed request (letter, SAE, IRC all in one envelope) to the Post Office and have them weigh it for you. I'd be surprised if it came in under 10g so the 20g price is £1.10
:)