Is it illegal to drive in flip flops in the UK?

No. Unless flip flops prevent you from using the controls in the correct manner. There is no specific law in the UK forbidding driving in flip flops. However, the Highway Code is very clear that you must not wear clothing or footwear that prevents you from driving safely.

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Whilst there is no UK law banning driving in flip flops, they can slip and become wedged under pedals. Should you be involved in a collision or be found to be driving recklessly, wearing flip flops is no defence and you could face a fine, penalty points and even a driving ban.