I noticed that B&Q had these 8ft trampolines with enclosure and cover on offer for £59 with free next day delivery (usual price £89).
Product Information :-
This 8ft trampoline is the ultimate summer garden accessory for kids or adults. Its steel frame with galvanised finish ensures the trampoline stands up to the weather all year round. Also included is an enclosure for saftey and a cover to protect the mesh when not in use. Product meets EN safety standard tests.