In reply to climber david:
Don't choose a Kindle Fire as its a hatchet job of Android. Why have an operating system which is restricted and heavily adapted to Amazon when you can have a completely unrestricted Android operating system that can happily take Amazon products?
My mom who is 66 has a Kindle and iPad but spends more time on the iPad. My dad 69, got a Nexus 7 recently and loves that.
I have an 10" Asus Tablet and love this as it has a real keyboard that can be removed at will and has more connectivity that any other tablet out there.
There are also 10" tablets that can also be had for well under £400. Apple isn't the big boy on the block any more.
Long story short, choose an Android but don't choose Amazon's version which is a restricted Android OS.