Realistically, what’s your budget before the £750 comes off? The relaxation seats on the Ioniq 5 and 6 are amazing for my back with it’s deterioration The Audi Q4 is quite comfortable, even the Enyaq had comfortable seats for me.
Post your budget and those essential spec items you need and I’ll see if there’s some I can recommend.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark