See also, this list of "Most banned books" from US libraries.
http://www.ala.org/advocacy/bbooks/frequentlychallengedbooks/decade2019
Interesting list (and its predecessors). Amusing, in a way.
Fahrenheit 451 only appeared, at a quick scan, in the 2000-2009 top 100 (maybe too much competition?) but Brave New World was in all lists (IIRC) and 1984 in at least two of them. (Banned by the USSR, naturally, but I know in the '80s, and probably at other times, 1984 was attacked in the US as being
pro-Communist, which tells you something about those that would consider this.)
It appears that the "What's happening to my body?" for girls is more bannable than the equivalent for boys, which was much further down the respective list.
Captain Underpants? Ooookay...
Lolita much further down the list than The Holy Bible, I noted.
...of course, we can't reject the possibility that some books were never enshelved
to be then proposed to be deshelved by ever so slightly more objecting "moral/intellectual guardians" of whatever the local flavour there was. I haven't yet delved into the yearly list information to see if there's context to the objections (and if they provoked action/non-actionable responses).
I've not yet found a similar UK list. Though interesting world-wide summaries. Dan Brown has been known to be banned by the Catholic church, for example, but not for being just badly written of course.