You can say that again!

Niche market for first ever Breton-Welsh dictionary

Headline in Western Mail today.

However, I remember going into a bookshop in Brittany owned by a Breton who spoke fluent Welsh. The Breton national anthem, as I recall, has the same tune as our own Hen Wlad fy Nhadau. You can find Alan Stivell singing it on this.