Lady from Macclesfield had a new concrete drive laid, but they used what
looked like big rubber moulds on it to make it look like paving.
Any idea what it is called and how to go about it?

Not seen the show, but...

I bought something that sounds similar from Wickes (?) a few years ago -
you lay a thin base of concrete, then plonk the (roughly) 800m*800m
wobbly shaped "stone-effect" mould on, fill in the gaps, tamp the
concrete down, and remove.

The shaped concrete stays pretty much in the shape of the mould, and the
mould is designed to tesselate so you get some variation on pattern for
larger areas.

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