Greg - You have scored a bullseye! I will be including music from England, which of course includes a number of Celtic areas including not just Cumbria, but Northumbria, Cornwall etc, etc. I will also be including the more farflung Celtic nations (Galicia, Britanny etc) not to mention areas like Occitanie and Friuli which border on and have overlapping traditions with Celtic areas.
I will also include people like Nic Jones and the Carthy/Waterson clan who regularly perform songs and ballads that most folk would categorise as Celtic.
Finally I will include performances by outright Celtic performers of non-trad material (thinking of Rab Noakes' performance of 'Walkin' the Dog' and Dick Gaughan's 'Games people Play') - Then there's Michael Marra, John Watt etc.
Oh, what fun!