Been eyeing up a 30 euro tent in decathlon comes highly recommended MH100 .
I know someone with one of those, they like it and they're experienced enough to know what they're talking about. Fiberglass poles, but you can't have everything. Also the pack size is a bit long for a rack. they've separated the poles and tie them to the top tube. for £30 you can't really go wrong!
That Kilo mat is top quality, but do you really need that? I have an excellent Sea to Summit mat, but for summer overnighters I use this one at half the weight and price.
https://www.regatta.com/inflatable-mattress-ebony-grey/?v=20230614&srsltid=AfmBOorj0m5y7apA5OB1Fvol_pWNka71iNXJBh2U7zxHfsH4n-mFaqqp9G0&gQT=1Can't help with the quilt. I spent a fortune on one 18 years ago and it's still one of my best camping buys. There wasn't a lot of quilt choice in the UK at the time and I bought from the US. More choice now, depending on how much you want to spend, often the only advantage to spending more is to save weight and bulk.
I don't carry any cooking kit on an overnighter, and anything up to a week I'll just carry enough to boil water for drinks and instant meals. It's easy to fill a pannier, even with basic cookware and food. Each to their own, but I'd rather not.