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Advice on Pond Liners

Well after 3 years in the new home we are now planning a pond. Its about 2,4m x 2,4m & will be about 1m deep (I hope). I've been looking at pond liners & there are Butyl Rubber ones which at O,75mm thick cost about £7 m2. Then there are Epalyn EPDM which are a bit cheaper. You can get free underlay included for the same price.

Or there are these https://www.pondkeeper.co.uk/flexiliner-5x5m-40yr-free-underlay/p2666 at just over £2 m2 with free underlay. It has a 40 yr guarantee. Am I missing something here? Is there a drawback they don't mention? Anyone know anything about them?