Thanks all. Lot's to think about and look at.
Just to answer a few points, and I should have specified before. 4x4 would be ideal. I used to have a 2wd and it was a nightmare for getting beached on clumps of grass, sticks, etc. Great fun on dusty tracks and tarmac, but for all round terrain, it was tough going.
Also I fully expect to break the car at some stage and don't mind buying parts, here and there, so a slightly "weaker" car, that is fast and fun, is no problem. I'm not bad on the controls, so hopefully won't total it immediately! 😆
Size likewise isn't a concern. I like small cars for their agility and portability and I like the big cars for their strength, and ability to manage larger obstacles. Thankfully I live next to a decent wild Park, so transport isn't a problem.
Sadly I've been racing around the last couple of days, chasing my toddler who just discovered tantrums, so apologies for the slow response and not looking over the specs of the linked cars thoroughly yet. I'll take a proper look at everything tomorrow.
Thanks again, guys.