Butyl Products LtdPond and green roof linings. Useful for:The Urban HandbookWaterways & WetlandsThese links show other suppliers useful in these handbooksWebsite:https://www.butylproducts.co.uk/Telephone:01277 653 281Address:Lingfield House, 11 Radford Crescent, Billericay, Essex, CM12 0DW