Here is my father's recipe from very early 1960's. We were in Pembrokeshire.
Yeast was either obtained from the local baker's, or else from someone's well (the yeast was kept down the well to keep it cool and fresh between brews), and yeast from the well was called "Barm". Barm top fermented, unlike the baker's yeast.
As a child, it tasted pretty good - I would be given a sip now and again!

Regards,
Simon.