In forty years I have used five tents...and the reason for changing them was never uv degradation. Stopped using the first tent I had because it was pretty heavy and I finally got enough money together to upgrade to a little Viper ridge tent. That was big enough for me and my daughter when she was small, but became too small as she grew, especially on longer trips when one can go a bit stir crazy if too cramped up. So invested in a Vango Spirit 200+. I sold this after quite a few years use It still had years left in it. Bought the Wild Country Duo tourer which I still have. And also bought a tiny lightweight one person tent for short trips when I travel just with a saddlebag and bar roll. Use this setup on the DunRun if I have the time , to camp there on the Sunday night. Will probably do something similar this year. I tend to choose shady places to camp anyway, if I can. Nothing worse than being woken up before you want to be by a rapidly heating tent. And then, as others have said, the tent will rarely be out in the sun for long if you are cycling during most of the daylight hours. For those short trips you are describing, get the lightest tent you can afford I would say.
Zips, poles and hook tabs, in my experience, are the things that you should worry about before uv degredation.
Hillebergs are lovely, but I have heard too much about zip problems with them to want to part with that much cash for a tent, when there are so many others out there that are perfectly decent, and not that much heavier, for less. I don't have that kind of money anyway. They also seem to go a bit flabby and need lots of retensioning, unless the ones I have seen have been badly pitched.
I use a Trangia cooking system...won't change now. Bought a set of plain Ortlieb backrollers or whatever they are called twenty years ago...still use them, they are fine and they have had some pretty rough treatment over the years, including being thrown down the sides of mountains when tracks became too rough and difficult to ride and the bike too heavy to push or keep hold of with them on. I did buy a set of Arkel's secondhand several years ago which were a tremendous bargain at half their new price. Lovely panniers which are so easy to pack and organise, ulike the Ortliebs, but to be honest, a bit too heavy and I sold them on and used the money to go towards a new set of Ortlieb Bikepackers with the pockets which the cheaper ones lack. These are great, although only had them four or five years so don't know if they will last as well as the more basic ones.