750mm is water regs for external pipes for frost and so they don’t get damaged when people dig
https://www.plastics-express.co.uk/black-twinwall-duct-50mm-x-50m-coil-p-pm399
https://www.plastics-express.co.uk/water-warning-tape-150mm-x-365m-p-pm731?search=Warning%20tape...
Needs to be 750mm deep
Ideally 20mm blue poly eg the stuff they use for water mains etc
I would put it in a bit of ducting 50mm
Y and a back inlet gully would be fine providing you identify flow direction
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