This is by Mairearad Green, from her Celtic Connections New Voices commision in 2009.
There was a video of it on YouTube, where I got this from, but I can’t find it any more :(
Mairearad has a great ear for a tune. Thanks for posting this.
Found it - snug in the middle between ‘Donegal Lass’ and ‘A Bottle Of Vodka, Forty Embassy Red And £50 Cashback, Please’