A slightly knackered Expedition Karrimat and an early 90's Ultralight Thermarest, that's been stored rolled up:

A GoreTex bivvy bag and an early 90's Rab Atlas 800 down sleeping bag that's been stored lofted in it's large bag:

I'm going to take the Thermarest with me, although I remember it being uncomfortable and sliding off it every time I moved. I'm sure I could buy something that packs to half its size and weighs half as much, but I have it, so I thought I'd use it and see how we get on. Given where I'm planning on going, that and the bivvy bag and Rab sleeping bag should suffice for sleeping arrangements. I'm also planning on taking a mug and Aeropress to make a coffee in the morning. Obviously I'll have the clothes and kit I've cycled there in, a phone, GPS, and I'll have my usual cycling paraphernalia too, i.e. spare tube, tubeless repair kit, puncture repair kit, tool kit, pump, zip ties and what not. Other than that, I need some advice on what else I need to take.
Stove: I was going to get an AlpKit Kraku but they've disappeared from the website, can anyone recommend anything similar? I don't like meths, so would prefer a gas canister based system of some sort.
PJs: Do people change into sleeping clothes of some sort, or do you all sleep in your clarty cycling kit? I sweat buckets, so was considering buying a base layer of some sort to sleep in, made from merino or bamboo or something. I did read something on here about wearing leg and arm warmers in the sleeping bag, but Shirley those are sweaty after riding?
Jacket: Would it be advisable to buy a down jacket of some sort to change into while setting up camp, and sitting around in the morning drinking coffee? Again, this is the sweaty kit thing, or are most bivvies a case of pitch up and go straight to sleep?
Is there anything else that you would consider essential kit that I've overlooked or am missing...?