Thanks again rayna.

Odd thread that. In so far the mod is trying to help and the questioner is getting stroppy with them!
But still helpful.

My problem is that her certificate predates the period when they started 'unique electronic reference numbers.'

I looked this up on Trinity's site where it was confirmed.

But since the certificate has been accepted in her SET(M) application, like you say the language test stands. This is clear to me now, but it's just which number to put in their UER box in the absence of a UER. I'm supposing it's not that important, and I can stick one of the other reference numbers in with an accompanying note.