A possible William in 1901
Reg. Dist. Newport
Piece No. 4962
Folio 267
Page 9
He appears to be residing here:- Institution name The Barracks
Institution location Barrack Hill Newport Monmouthshire
His occupation is listed as Driver, Royal Field Artillery
Born Yeovil but birth year given as 1883. I can't see any 1883 birth for a William Sartin. I assume this is the birth record that you have:-
SARTIN, WILLIAM GILLARD
GRO Reference: 1881 S Quarter in YEOVIL Volume 05C Page 426