The Elliots Primary EoN or EoN Type 7 S.G.38 Primary was a training glider developed in the UK shortly after World War II.
It was an absolutely minimalist aircraft, consisting of a high, strut-braced wing connected to a conventional empennage by an open-truss framework, and was a copy of the German SG 38 Schulgleiter. Marketed to aero-clubs, the Primary EoN was also adopted in 1948 by the Air Training Corps and by the Combined Cadet Force under the name Eton TX.1.
Source: YouTube
We had one like this when I was at school in the early 60’s, bungee launched and terrifying