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Would be pricey, local garden centre or Screwfix sell it.
https://www.screwfix.com/p/capital-valley-plastics-ltd-damp-proof-membrane-black-1000ga-4-x-25m/88322
crossedthread
@kkg337
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