It was one of the very few fictional stories I loved as kid, read (partially) all the books (don't own them though).
I remember renting some very old audio cassette tapes at my local library (Five Have Plenty of Fun & Five Run Away Together (the later tapes of Run Away Together were faulty) that precisely narrated the exact writing of the books, and they lasted several hours!
I also once owned all the adventures in much shorter durations (just over an hour) on audio cassette in the early 2000's, and even a tape featuring the Famous Five in made up adventures (termed "Five Have a Puzzling Time and other stories" I believe) and the latter was the first that I ever bought.
As of today I now have all of the original 1978 TV series on DVD box set, but I not the 1990's tv series version though (Five on a Treasure Island is the only one I have)
I loved Timmy in the 1970's TV series as he was a beautiful border collie.
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Diagnosed with "Classical" Asperger's syndrome in 1998 (Clinical psychologist).
RAADS-R: 237/240
Aspie score: 199 out of 200
Neurotypical (non-autistic) score: 1 out of 200
Alexithymia Questionnaire: 166/185 AQ: 49/50 EQ: 9/80