Just looking at options (Canon).
The 400D is available for around £80 at MPB. This was a 4.5/5 Camera a while back with great reviews for image quality.
Agree with Charlotte, it's hard to buy a "dog" from one of the big manufacturers if it's from the last 8 years or so.
Canon/Nikon basically offer the same spec at the same price so don't get hung up on that, you won't go wrong with either brand.
The 50mm f/1.8 from Canon is famously just about the best bang-for-the-buck lens you can buy after your first kit lens.
I used to have one and it's a cracker (mine was £89 new) but it's not a general purpose lens, more like a budget portrait lens.
I'm still a fan of the budget 18-55 kit lenses as a starting place. It's reassuring to know, when you're hiking through some woods, that you only have a £45 lens fitted.
My current "carry lens" weighs a ton and I can't afford to bang it on a tree.
Edit. If I was buying a Canon crop-sensor then I'd ask for the Canon EF-S 24mm f/2.8 STM "pancake" for Christmas. Stick that on my tiny EOS 100D and you'd have a lovely setup for walk-about photography.
This is my EOS with a 40mm "Pancake" with a CD for scale. It's teeny but the 40mm on a crop-sensor is a bit of a no-mans-land of a focal length, the 24 would give you a really useful 38mm equivalent. (Now I'm talking myself into keeping the 100D and buying a 24mm pancake for it... this is a poor sales pitch)