thanks for all the advice. black plastic - pond liner?
edit: this.. https://www.ebay.co.uk/itm/4M-X-30M-500G-BLACK-HEAVY-DUTY-POLYTHENE-PLASTIC-SHEETING-GARDEN-DIY-MATERIAL/252459581154?hash=item3ac7c37ee2:g:mNAAAOSwddNXgTUw
Would be pricey, local garden centre or Screwfix sell it.
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