Dd is churning through Blyton, having started with my original Faraway Tree and Wishing-Chair. Ds found them too scary, especially the idea of children being hit (Dame Slap etc), so had to reassure him that yes, children did use to get hit routinely if they didn't do as they were told immediately, but I didn't think it would help so I don't,and teachers aren't allowed to any more (and yes, I got hit by teachers a few times). Dd just thinks it hilarious.
I'm not sure, but I think the Secret Seven's four totally unmemorable characters - two boys, two girls - have been swapped about a bit, making them less sexist, but Peter is still a bossy git, which I mention when I read a chapter. I've also been explaining how many people in the 50s thought girls and boys should do different things which is why the Famous Five books go on about George. When I read chapters out loud I leave out some of the mentions of good as a boy, who gets asked to wash up, etc, and emphasise that Julian, Jo etc are older than the girls, as well as substituting odd/wierd/funny for 'queer' - and reading the odd chapter helps with explaining stuff like smoking, the wireless and telegrams, money, as well as the attitudes, and can explain eg about Dummy the brain-injured porter, who apart from the name is portrayed remarkably sympathetically (only the baddies laugh at him).
I don't have a copy of Island Of, and won't bother seeking it out, as it was yet another secret passage/sea one, and the sequels were much better. Though I managed to read it a few times age 9-10 and never noticed Jo-Jo was meant to be black, for what it's worth.