The 15-year-old, surfing as part of his school team in Woolacombe, North Devon, over the weekend, performed with style and power to take the title in clean three-to-four-foot conditions.
The Jersey youngster, rated a dark horse before the start, surfed with intelligence in the qualifying rounds and really turned it on in the final to emulate Phil Le Neveu’s win in the U16 bodyboard final last year.
Glenn is Jersey’s first-ever British Schools longboard champion.
Le Neveu claimed silver this time round in the U18 bodyboard division, surfing consistently against many older rivals and fully deserving his reward.
Bradley Ferguson also impressed the judges with his gutsy surfing in the U14s shortboard.
Ferguson won all his qualifying rounds to reach the final where British pro judges placed him second, just behind local lad Beau Bromham.
There were also outstanding performances from the rookie members of the De La Salle team, with Aaron Ward in the U14s and Jamie Russ in U16s both progressing through to the second round despite limited experience at national level.
Two others, Nathan Cook and James Walker, were knocked out in the opening rounds by British team surfers, who were competing to qualify for the Junior World championships in Portugal later this year.
Over 120 competitors from 35 schools throughout the whole of Britain entered the event.
Assistant head master Scott Stevenson, leading the party along with Jersey Surfboard Club coach David Ferguson, said: ‘This is a testament to the boys’ perseverance in training and the Jersey Surfboard Club’s junior programme.
This is a good example of how local clubs and schools can work together and share good practice in order to enhance a child’s education.’