The Day­light Music ses­sions at Union Chapel in Isling­ton are gen­tle, pay-what-you-like lunchtime con­certs with tea and cake. There are around 30 ses­sions per year. This Sat­ur­day was the turn of artists on the Lost Map record label run from the remote Hebridean island of Eigg by John­ny Lynch, who per­forms as Pic­tish Trail. Lynch and…