What tablet is best for drawing and writing?

Hello, I'm looking for a tablet that I'd mostly be using for drawing (so it has to include a pen, which isn't just a tacked-on feature but is actually smooth and pleasant to use with nice pressure points) and writing (I'd buy a wireless keyboard). I'm looking for something, hopefully under £500 and size to fit in a bag easily for travel, but not too small. Android compatible. I won't be using it for anything else, so colours, audio, and screen quality are no concerns of mine.

Any recommendations would be greatly appreciated!