To those from the USA sending to the UK, IRCs are a waste of money. They don't cover the postage you pay for them, as each one only covers one airmail stamp, you'd need at least 3 to cover enough postage, which costs you over 5 bucks being they are 1.70 a piece, you are better off to enclose 3 U.S. dollars, I've had terrific success that way, and it pays enough for return postage, and saves me money. Just in the last few days I have gotten back Oliver Ford Davies, Julian Glover, and Ken Colley using this method, all those 3 took less than two weeks sending from Indiana USA.