Enlisted (in 1906) as Harry Scott, and so is filed in the SCO section of the WW1 Service Records (WO 363):

Henry LAIDIG, married Mary Isabella KERR at Edinburgh, April 1910.
3 children: Harry (1910), Fred (1912) & William (1914) - one of these may have died before 1919 (the widow receives allowance for only 2 children).
Brother: Charles.

A butcher by trade, he enlisted (as Harry Scott) in March 1906, declared age 19y 7m, born Fort George, Inverness. Served with the RA (RH & RFA), Regt No 42119. Died of wounds September 1918.

Anc****y, SCO, pages 106151 to 106193