Best dystopian books

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I've read Fatherland, 1984, The Stand, Handmaid's Tale, etc. Am looking for recommendations along those lines .. plague, aliens and the like

What's the best dystopian book you've read?

Mostly place marking as there are so many good suggestions on here.

Love John Wyndham. Described as ‘cosy catastrophe’ in a somewhat negative way it has normal people in not normal scenarios. My favourite is Kraken Wakes.

Has anyone read the Farthing trilogy by Jo Walton? It’s an alt-future where we didn’t fight the Second World War. I quite liked it and it was a fairly easy read.

And @dudsville how was the 1666 sci-fi?

Flawed by Cecelia Ahern is very good. It's Young Adult genre but really isn't teeny-bopper stuff it's gritty and even quite violent in places. It's about a world like ours except, alongside the criminal justice system, there's a system for "flawed" people. So people with dubious morals (like blokes who shag their wife's sister). They are trialled and branded (literally with a hot poker) as "flawed", the theory being that they can't get high-up jobs or positions and so only honest people will be in power. But actually it's very 1984 in the way the system is run and it's the little people getting branded for thought crimes etc. Very good, I'm saving my copy for when DD is older as it raises a lot of questions about how we treat people who make mistakes.