In an earlier contribution to this discussion,
rbel wrote:

All the cold water piping from the tank to outlets in our 1970s
property is 17mm OD grey plastic piping. Grateful for any
suggestions on how to adapt this to copper. I would strip everything
out and start again but the existing is neatly buried in walls or the
concrete floor.

That's an unusual size! What sort of fittings are currently used? Can you
upload a photo of a bit of pipe with a fitting somewhere on-line, and post a
link to it here?
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Cheers,
Set Square
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