@mike_s, you may already be aware of it but Caitlín has two websites for lessons, her original Irish Concertina Lessons one, and also her more recent one that focuses on teaching session tunes, with the ability to slow sections down, loop parts etc.:
https://learnirishtunes.com/
@Notemaker, surely it wouldn't be too difficult for you to have the courtesy to spell Caitlín's name correctly?