Which 240mm AIO for <£75

If low noise is top priority then I would always recommend the be quiet! Silent Loop 2 range but it's a fair bit above your budget.

If you buy an AIO where the fans are PWM and have standard 4pin connectors to the motherboard (rather than proprietary connectors that go to the pump unit) then you can always replace the fans for quieter units later on.
 
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