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There are a number of species of Tetragnatha spiders - a common name for them being Stretch spiders. When alarmed, it will run from its web to a leaf, where it will stretch out its legs in front and behind, to appear less noticeable to predators.
Some species are often found close to water eg garden ponds.
Thanks for the interesting information!
Lat/Lng: 52.7, 0.3
OS grid ref: TF5820