Hmmm yes Istr that the Bergie seat wasnt all that comfy either LOL.
The K13 really was (almost) a 2 seat K8,and still a very widely used club 2 seater over here.
The blanik was strange because the front seat was like sitting in a tin armchair (very comfy) but the back seat was cramped and uncomfy.
Some of the students in zimbabwe had trouble converting from the Blanik to the Slingsby Swallow,one minute in a tin armchair - the next ...in a little wooden thing with (seemingly) no nose,a few just could not cope with the change,but the 2 seaters were too valuable to risk on early solos.
Much easier to use the german system of Ka7 or K13 and then into a Ka8 where you felt quite at home.
rgds baz