What a great find, Augusta! Thank you for posting this link for us. I found it interesting to hear this play via a radio; I really had to listen carefully and exercise my imagination. Very different from watching a play on TV.
I did not detect an Irish Accent when Bridget spoke, either.
Lizzie spoke faster than I expected her to, after all, she didn't do anything in a hurry. Or did she? On the day the murders occurred Lizzie appeared too calm given the circumstances of a double murder in her home in broad daylight. By her speaking so fast in this radio play, it gives me the impression that she was displaying a higher state of emotion than the calm, cool and collected Lizzie that everyone observed on August 4th, 1892.
Oops! Lizzie addressed Abby as 'mother'???

Hmmm, Lizzie testified that she addressed her 'step-mother' as 'Mrs. Borden'.