Wanting to send the six pounds to the Registrar for a certificate, I have just been to my local Post Office and was asked -if the Registrar will take US dollars International Money order ? or do they take Western Union ? Can anyone enlighten me please ?

Trying to find a cheap way of sending the money from Australia rather than the bank cheques--which cost 15 dollar fee ( Aus) last time
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It is weekend here so no use asking The Office of Registrar. I think they would all be asleep >G