Andrew, happy to read that and welcome between us, 15's pilots!
I never flew a 15B, but I'm getting addicted to my sn 15106...
https://www.alexander-schleicher.de/wp-content/uploads/2017/08/GAL-2017-07-17-Giancarlo-Falleti.jpgAnd it's still one of the most beautiful and admired gliders around. Last saturday, I was waiting for the tow, when a guy approached and said: "Ah, the ASW15! I used to fly one many years ago, and when I saw yours I couldn't help to come and look at it close, among all of the other gliders here"
And there were Duodiscus, Discus, LS4, ASW20 (a beauty too), Ventus 2, DG300 and so on.
As to Balleka, I spent my last summer holidays in Devon (Torquay), dreaming to fly the sky - and the coastal ridge (!) - where he has flown so many times. Never met him, but his fate made me as sad as if it had happened to a close friend....
Happy landings and enjoy your 15!
Giancarlo