I posted before about the Medieval Cornish drama Bewnans Ke. I’ve recently discovered a .pdf file of a translation draft, by Michael Polkinghorn. It’s well worth taking a look at.
Thomas Kinsella. Translator.The Tain: Translated from the Irish Epic Tain Bo Cuailnge.Oxford University Press. ISBN13: 9780192803733.
Barry Cunliffe. The Ancient Celts. OUP, 1997.