Spider webs have existed for at least 100 million years, as witnessed in a rare find of Early Cretaceous amber from Sussex, southern England. Insects can get trapped in spider webs, providing nutrition to the spider; however, not all spiders build webs to catch prey, and some do not build webs at all. “Spider web” is typically used to refer to a web that is apparently still in use (i.e. clean), whereas “cobweb” refers to abandoned (i.e. dusty) webs. However, “cobweb” is used to describe the tangled three-dimensional web of some spiders of the theridiidaefamily. Whilst this large family is also known as the tangle-web spiders, cobweb spiders and comb-footed spiders, they actually have a huge range of web architectures.
In traditional European medicine, cobwebs are used on wounds and cuts and seem to help healing and reduce bleeding. Spider webs are rich in vitamin K, which can be effective in clotting blood. Webs were used several hundred years ago as gauze pads to stop an injured person’s bleeding. http://en.wikipedia.org/wiki/Spider_web
Fen Raft spider The extremely rare Fen Raft Spider is found on the Pevensey levels but I don’t know what species of spider made these webs