My training institution is long gone too and the transcript of training wasn't available at the NMC.
I spoke to NMC and they told me they send an EU directive instead and APHRA are used to this.
They told me when I rang that they had sent it that day. I also got a letter confirming the Statement of good standing that they ask NMC for.
The only other NMC document I sent was the statement of entry.
I sent mine to Darwin based on recommendations here.