I absolutely agree with you about "Girl on a Swing" Elrel, roses, skweek to the point where I threw a perfectly good hardback in the bin! I can't remember why it so upset or disturbed me, but it coloured my opinion of Richard Adams ever after.
I found Girl on a Swing so unforgettably, unpleasantly, haunting that I read none of his subsequent books. Watershipdown. A real page turner, some wonderful characters and unforgettable in the best way.
I really loved Watership Down & I remember it was the first 'real' book my elder son read. He came down the stairs in floods of tears & said- 'Oh Mum I am so sad that book had to end'. I knew just how he felt.
I started to read it to GSs at bedtime but it is hard to get through when there may be 6 weeks or so between their sleepovers- even skipping the fables. I'm hoping they will read it themselves soon.
Not bad for a story to amuse his children on a car journey. Thank you for all the pleasure it has given me.