That was my requirement last year. But I could not find anything light enough or suitable enough. I liked the idea of the Stratosphere but ~£120 it was too expensive. I looked at the Gossamer too. Both of these are Bivvy tents, but something about them both put me off. I looked at Gelert Solo (cheap and very well reviewed tent.) but not really 3-season from what I can tell.
I whittled it down to between the Solitaire Aluminium (£70) and the Zephyros 1 Tent (£100). Went for the Zephyros 1, but then my plans changed so I cancelled my order. But I will be ordering it very soon! Youtube has some great video review and setup guides.