When I saw this, I was about ten years old - very impressionable - but this struck home in no uncertain way! And although I probably didn't understand most of it, it still struck home. So much so, that when I was in a record store as a thirty-year-old, and the title music blared out of the speakers, I simply had to have that record!
Should you remember that moody introduction, it is taken from the first movement of Prokofiev's 'Scythian Suite' - it is, in fact, the second theme.
I also remember the whole family being angry first when Rab was suddenly played by someone else, and then when the series was suddunly cut short and we never saw the remaning episodes. This was in The Netherlands, by the way, so don't blame the BBC!