Great question — answering as the UphillTech team:
The variability of the UK weather means that light options can be realistic. Last year I had a week in Scotland sleeping under a tarp in a lightweight sleeping bag, with no rain. Some people use a bivvy bag under a tarp, either a full size one, or a little tarp just to give some space for cooking etc. and allow opening the head end of the bivvy bag. Bivvy bags give a level of subtlety for wild camping that nothing else really offers, but could be very cramped on campsites, as well as out of place. It really does depend on what sort of camping you expect to do. All this means that if you have a tent and a bivvy bag (and/or tarp), you can choose what to carry when you pack a few days before...
Full answer by Chris H: https://outdoors.stackexchange.com/a/28232 (CC BY-SA 4.0).
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