Warriors Academy ace Matt Kvesic captained England U18 for the first time as they secured a 29-9 victory over Scotland.
Marland Yarde extended his red-hot try-scoring run with four more touchdowns as England stretched their winning streak at Under 18 level to 17 international victories.
The London Irish wing helped himself to at hat-trick at Twickenham on Wednesday as his school side Whitgift captured the Daily Mail RBS Cup with a 34-10 win against RGS Newcastle.
He went one better on the opening day of the Five Nations Festival at Llandovery with four contrasting scores in the second, 34th, 35th and 56th minutes against the Scots.
Joel Hodgson - on the receiving end for RGS Newcastle in the week- scored England's fifth five minutes from time and Tommy Bell (Bacup and Rawtenstall & Sale Sharks) kicked two conversions. Scotland full back Jamie Urquart replied with three penalties.
England had made nine changes from the side that put 43 points on Wales six days earlier with Worcester No.8 Kvesic taking over the captaincy from George Ford, the Leicester Tigers fly half who made way for Bath's Tom Heathcote.
Kvesic said: "It's the first time I've captained the team and I really enjoyed it. I thought I played quite well and got around the park.
"The pitch was surprisingly good given the conditions we've had here. We chucked the ball around and played some good stuff, the forwards did well and the backs looked really dangerous.
"In the next few days we'll look at controlling things a bit more and being more precise in certain places. We know how good we are and that we could do with playing a bit more in the right areas.
"Beyond two or three phases we're always looking to score because we've got the players - like Marland Yarde - who'll finish.
"People like him are so valuable and maybe we've got to look to get the ball to him earlier, because if you give him 15 metres one on one, or even one on two, he'll break them down and beat defenders."
England controlled most of the first half playing into a strong wind with Ben Ransom countering well from full back, but they conceded kickable penalties, three of them at their dominant scrum for which loose-head Luke Cowan-Dickie was yellow-carded 23 minutes into the game.
Full back Urquart kicked three of them - in the second, 12th and 20th minutes and missed the fourth from long range - but his side still trailed at the break, though, courtesy of Yarde's masterclass in finishing three eye-catching tries.
The first was probably the most satisfying for England's coaches, an attack down the left followed by Sam Twomey's rampaging run through the middle and well-judged offload.
The second, outside the final man with the Scots overloaded on the right, was more routine but Yarde's third was a sensational solo effort with five defenders beaten by a combination of speed, strength and footwork.
Despite playing with the wind at their backs after the break, England struggled to establish continuity at the start of the second half against some spirited resistance, Urquart missing a difficult chance early on and Scotland snappily attempting to counter when they did get their hands on the ball.
Gloucester Rugby centre Ryan Mills provided a steadying influence, though, and another replacement, Elliot Daly, slid the kick into the corner that gave Yarde the opportunity to sprint and slide over to touch down his fourth.
The final five minutes saw some of England's best attacking work, Dom Barrow losing the ball stretching for the line from one sharp build-up before Hodgson jinked his way over from close range