Mis-filed in the MAR section of the WW1 Service Records (WO 363):

Robert Alexander McLAREN joined the RFA on 12 September 1914, declaring age 19y 5m, born Stockton on Tees.
Served as Pte 26797 until demob in 1920.
Home address: Stockton.

Anc****y, MAR, pages 105350-105359