I bought a 12v relay from Maplin that will switch 240v to power the pump I have with a 10mm outlet. I have wired it all up and tested the switching action. Success. I've put pins on the flow meter (snipped LED legs) and made signal cables for the relay with more pins from an old Nokia power supply that had an inline step-up adapter.
Luckily I had a 3 pin mains socket, they wanted over £ for one in Maplin. Mine still has the 99p sticker from Wilkos.
That means I'm ready to start pumping some water.
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