England Under-18s suffered a first defeat of the international period when they lost 23-15 against Wales in Swansea on Sunday.England, with Tigers Academy wing Sam Yawayawa making his first starting appearance at this level, scored tries through Theo Brophy Clews, Dominic Morris and Rotimi Segun. Wales also scored three times but fly-half Billy McBryde kicked the extra points.   Forwards coach Pete Walton said: “We’re disappointed because we know that we didn’t really turn up. Wales were very good and deserved the win. Our ball retention wasn’t good enough and we didn’t do what we’re capable of at the breakdown.   “But this will be valuable experience for the players. You don’t become a bad player because of a defeat, our job is to make sure these lads become better players because of it.”   England Under-18 15 Mathew Protheroe (Hartpury College) 14 Sam Yawayawa (Leicester Tigers, Wyggeston & QEI College) 13 Dominic Morris (Saracens, New Hall School) 12 John Williams (London Irish, St Pauls Sunbury) 11 Rotimi Segun (Northampton Saints, Stowe School) 10 Theo Brophy Clews (London Irish, Abingdon School) 9 Alexander Mitchell (Sale Sharks, Lymm HS) 1 Jake Pope (Sale Sharks, Myerscough College) 2 Curtis Langdon (London Irish, St Pauls Sunbury) 3 Jack Stanley (Exeter Chiefs, Truro College) 4 John Hawkins (Northampton Saints, Stowe) 5 Alexander Moon (Northampton Saints, Sedbergh School) 6 Archie White (Harlequins, Epsom College) 7 Will Allman (Northampton Saints, Trent College) 8 Callum Chick (Newcastle Falcons, Gosforth Academy)(c)   Replacements 16 Dan Frost (Bath Rugby, Filton College) 17 Mofe Wilkey (Harlequins, Trinity School) 18 Billy  Keast (Exeter Chiefs, Truro College) 19 Matthew Postlethwaite (Sale Sharks, Ilkley Grammar) 20 Zach Mercer (Bath Rugby, Merchiston Castle School) 21 Jack  Maunder (Exeter Chiefs, Blundells School) 22 Owain James (Wasps Rugby, Harrow School) 23 Elliott Creed  (Gloucester Rugby, Chosen Hill)