
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

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Personally I am UL-allied and accommodate my cranky needs despite that ruining my BW. So will not react in horror. I haven't tried this but my wife and I use a Duo and love it; personally I'd try the shorter one; and if it doesn't work out swap up. (I still use the crinkly Thermarest UL thing and you could carry that in addition to the short Ultra and still be a few grams shy of the long one lol.)
I hate my NeoAir, I don’t find ThermaRest pads comfortable at all. I’d take a CCF over a Thermarest. For trips where I want an inflatable over a CCF, I just got a Nemo Tensor since they’re on sale at REI (25% off). At least in store, it felt a lot better than my NeoAir or CCF.
Seems like a great all around option. A little heavier than I would like on because I need a long/wide, but I sleep like shit on the NeoAir. I wake up multiple times every night off the pad, slide around, bottom out and my body hurts in the morning. The CCF pad I have is better, but also not warm enough a lot of the time.
Thermarest neoairs are too loud and crinkly for me. Rab style of mattress doesn't do well for me as a side to belly sleeper. Nemo is my pick because the only air pads I've kept are Nemo. An astro non-insulated pad is my summer pad with an older cosmo insulated pad being my 30 to 55-deg pad.
You should go to REI if you can and try out different pads. I had a very hard time sleeping on the neoair, the horizontal baffles killed my shoulders (Im a side sleeper). I recently got an exped 5r mummy which is still under a lb depending on size. I love it. Its so comfortable, it feels sturdy, doesnt slide around. I sleep better than I ever got on the trail I love it. I think its a nice balance between very light & obscenely heavy (like the neoloft).
I'm also from the UK. I have been through a lot of tents and air mattresses trying to find the right duo! Right now I have the Thermarest Neo and the Alpkit Jaran. Perfect duo!
Exped megamat for car camping, thermarest neoair for backpacking

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series