Commencing their first innings on day two at 115/2 in reply to England 190 all out, the Sri Lanka U 17 (development squad) posted a mammoth 399 for 9 in a splendid batting display spearheaded by S Arachchige who faced 131 balls for his 105 with 12 fours.
A Fernando completed his night vigil on 56 while K Bandara (65) and skipper Chemika Karunarante (66) in a later middle order battle set the tone for a superior finish.
B Taylor scalped 3 for 96 for the England Development Squad.
