Astral, that certainly show`s the difficulty that comes from learning, and when not getting the same instructor on each occasion.
It`s hard to work out exactly what would be a useful way forward, without increasing prices of having professional instructors, or where it would be unreasonable for the same instructors to be flying every weekend.
It took me just 11 years from first flight to solo...with School, college, University and working slowing things up, as well as flying at Portsmouth Naval, Leeds Uni, Southdowns and Lasham. I managed to get solo at the Inter University Gliding Competition week at Lasham, after having a sustained period of flights with the same instructor.