The Grob? Your readers experience was in the Chipmunk, doing aerobatics near the Severn Bridge having flown out of Filton, back in the late 60's and early 70's.
As for Gliding, the Kirby T31 was what I went solo on -- flew like a brick outhouse (https://en.wikipedia.org/wiki/Slingsby_Tandem_Tutor).
But I was also lucky enough to get so much height off a winch launch in a T21 Seburgh (https://en.wikipedia.org/wiki/Slingsby_T.21) the pilot did a loop and a Chandelle (stick Back hard and as she starts to stall push the stick hard left and forward with plenty of left rudder -- glider ends up with wings vertical and then you use the stick and rudder to level out as you dive -- basically drop sideways on with the ailerons and rudder turning you to a recoverable position a you gain speed) in a Glider with no canopy That was FUN.
With Flight Sim, back in the day... I flew Munich to Milan in the sailplane in real time 6.25 hours I was sat there.....