Number eight Will Safe was a physical presence as the English spent plenty of time working hard in defence and front rower Jack Spencer was a replacement.
England's Harry Mallinder and Scotland centre Adam Hastings exchanged a pair of penalties in the opening quarter of an hour (3-3).
The men in white then crossed the whitewash on the 20-minute mark after a bulldozing maul powered its way up to the five-metre line.
England kept up the pressure on their Scottish counterparts forcing them to hold out against repeated pick and goes before stand-off Joe Marchant sent an inch perfect cross-field kick to the on-rushing wing Rotimi Segun who collected well to score (3-8).
With the conversion missed, a concerted effort from Scotland to hit back from the restart was rewarded almost immediately with a kickable penalty, which Hastings slotted once more to narrow the gap at 6-8, before Mallinder knocked over his second penalty of the afternoon to send the English into a five-point lead.
Half-time: Scotland U18 6-11 England U18
It took a quarter of an hour for the scoreboard to be troubled in the second-half and it came in the form of an England sucker punch as Scotland piled on the pressure between the opposition 10m line and 22.
England and Gloucester Rugby back-row Sam Underhill capitalised on turn over ball to race 50 metres to score, before Mallinder converted (6-18).
Scotland continued to threaten, with standoff Rory Hutchinson and centre Josh Laird linking well to send the ball wide to replacement wing Reuben Norville who just couldn't control the ball as he dove for the pass at the line.
Despite late pressure and industry from the hosts, it was England who crossed twice in the closing stages of the game, Charlie Thacker and Joe Marchant the scorers, with centre Mallinder the creator once again.
England won the second half 17-0 as tries from BMW Man of the Match Underhill, Thacker and Marchant took the game beyond Scotland.
Fletcher said: "We were pleased to get the four tries but feel that there's still a lot to work on. We made a few too many errors, but to be fair to Scotland - they more than played their part. We were pleased with the way the front row stepped up and our back three did well too.
"The bench added something when they came on, which was great, and we now focus on attention on playing Wales in a couple of weeks and performing well against them."
Congrats to the trio of Gloucester Rugby Academy players involved!
Full-time: Scotland U18 (6) 6-28 (11) England U18
Scotland Under-18: 15 Ruari Howarth, 14 Ben Robbins, 13 Adam Hastings, 12 Josh Laird, 11 Robbie Nairn, 10 Rory Hutchinson, 9 Hugh Fraser; 1 Murray McCallum, 2 Jake Kerr, 3 Zander Fagerson, 4 Stephen Ainslie, 5 Andrew Davidson, 6 Scott Burnside, 7 Matthew Smith, 8 Jamie Ritchie (c).
Substitutes (all used): 16 Lewis Anderson, 17 Gary Robertson, 18 Callum Sheldon, 19 Lewis Wynne, 20 Ally Miller, 21 Andrew Manson, 23 Reuben Norville.
England Under-18: 15 George Perkins; 14 Rotimi Segun, 13 Lucas Slowik, 12 Harry Mallinder, 11 Kai Little; 10 Joe Marchant, 9 Jack Maunder; 1?Lewis Boyce, 2 Jack Walker, 3 Jack Stanley, 4 Stanley South, 5 George Nott, 6 Sam Smith, 7 Sam Underhill, 8 Will Safe.
Substitutes (all used): 16 Ollie Adams, 17 Owen Hills, 18 Jack Spencer, 19 Huw Taylor, 20 Callum Clark, 21 Alexander Mitchell, 22 Charlie Thacker, 23 Taylor Prell.