I still have all my Trebizon books - most of them signed. My best friend and I were allowed out of school to go down to Weymouth, where Anne Digby was at the children's book fair.
Also still reread The Changeover - and it is not unknown for me to head to the children's section in the library to see if there are any Margaret Mahy or KM Peyton titles I've not read. I was a bit in love with Pennington, and Jonathan Meredith, for different reasons.
We had Judy Blume's Forever confiscated by the headmaster when we were reading it break in the playground when we were 12. He thought the subject matter a little advanced (other Blume titles were fine.) Never caught us with Flowers in the Attic or Lace.
I reread all the Dark is Rising books about a year ago - they're still great. Loved Diana Wynne Jones, too, especially the Chrestomanci books. I think Cornelia Funke's Inkheart series remibds me of them.
Robert Westall, too, especially Devil on the Road and the Wheatstone Pond (which was a Saturday afternoon play on Radio 4 a few years ago.)
I think my mother was disappointed I didn't take to Jean Ure as she did, nor SE Hinton (though I did read them to find this out.) I also wasn't keen on Nicholas Fisk, who I think wrote A Rag, A Bone and a Hank Of Hair, which I think someone mentioned upthread. But he also wrote Grinny, which I really didn't like.
I read Wyndham (had reread a lot of them shortly after clearing my mother's house, as they were on the shelves.) John Christopher, too. Tripods was televised around 1985 or so, and as we didn't have a TV, I was allowed to go to tea at a friend's every week while the series ran, so I could see it. I also insisted on reading 1984 over Christmas in 1983 when I was 11, but I didn't really understand it - I reread it last year, and I sometimes think one of my managers is using it as a manual...
I was rereading things like Tolkien and Laura Ingalls Wilder, too, and branching into my parents' books - had a Gaskell phase at one point. And I was also moving away from exclusively fiction. I read WG Hoskins' the Making of the English Landscape when I was 16 (mostly to impress a geog student on whom I had a massive crush still do a quarter century on, he mailed me tonight.)
I discovered John Marsden when I was in Australia and now have the Tomorrow books and the Ellie Chronicles on my shelves. Haven't they recently made a film of it?
Douglas Adams, of course. Stephen King. Dean Koontz.
And Jane at the library introduced me to Mazo de la Roche, the Whiteoaks of Jalna. I was a bit in love with Renny, too.
I read pretty much anything which came my way.
I still have most of all these I've mentioned on my bookshelves, and I do reread them now and again - good comfort reads.
I think only the first SVH had been published by the time I left school, and no Point Horror or Babysitters yet (I had a Saturday job at the library, so got to shelve even more things than I read.) I did quite like the do your own adventure books, but I tried to read my way through all the options after I first got to the end, just so I'd know what I missed.
David Eddings was very popular with some girls at school, but I only read them as an adult, with a boyfriend who was a big fan.