Alpkit have had their Mora hammock in their line up for a couple of years now - https://alpkit.com/products/mora-hammock (£40) but they've now added a few more hammock related items. Bug net - https://alpkit.com/products/mora-bug-net - not sure if 490g is lightweight or not, experience with Alpkit's definition of "lightweight" suggests not. £20 Synthetic underquilt - https://alpkit.com/products/mora-hammock-underquilt - they've quoted CLO values rather than a temp rating but searching around it seems that type and quantity of insulation would be around 7-8C. £50 They've also added a couple of square tarps, one is 3x3m https://alpkit.com/products/3-square (£35), the other is 4x4m https://alpkit.com/products/4-square (£50). The 3-square is big enough to use with their hammock and have "winter" doors. So for £145 you'd get a full hammock setup (minus top quilt or sleeping bag) that should be good for summer. Does come to 2437g without the top quilt (see earlier comment about lightweight) but you'd be spending a lot more to significantly reduce that.