After entering the red building, head left and outside, then break down the pile of rubble on the far left to reveal this item.
"19 April 1915
I'm in the town of Ypres in Belgium, a pretty wee town that must have been braw before the war. The beer too inne bad. I'd much rather be downing ale with you though, boy. I'm off to the front in two days, take care o ' yerseln and say "how do" to the family.
John Mc Cormack"