An infrared light switch?

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If you want it cheap and easy, just replace the bulb with a remote control "smart" bulb.

Loads for around a tenner from GU10 to standard bayonet.
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[331X2]

https://sonoff.tech/product/wifi-smart-wall-swithes/tx-series

Sonoff switches can be had in UK pattern switch plates with RF functionality when paired with the common black/silver remotes you see everywhere

[chris-red]

I used to have these before alexa.

https://www.uk-automation.co.uk/green-i-single-gang-pir-dimmer-switch/?gclid=CjwKCAjwtO7qBRBQEiwAl5WC2yAIBrSqmiZEowehZ-DVEfdXhTREiR9Z8N9yEbyd_be4F18R8GXFiRoCvBkQAvD_BwE

Doesn;t work with LEDs though.
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
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