Native speaker incompetence

On sentence-initial interrogative particles, I said:

This is unusual among Indo-European languages in Europe, Latvian being another exception.

forgetting the example I knew fine from my native Lothian Region (as it was at the time), “eh”. I don’t recall seeing this written down, though, and my Concise Scots Dictionary has nothing relevant under “eh”, “ae” or “ay”. An example?

Eh there’s a sentence-initial interrogative particle you know already?