It seems to me that your needs are quite basic, and so a basic box will do fine,
I recently bought a box for my mum who has the same needs as you (basic TV viewing only)
The box was just under £20 from asda, and works like a dream. Easy set up, small size (its about the size of a portable CD player)
It simply connects to the TV with a SCART lead. Set the TV to the AV channel, and use the remote that came with the box.
Easy, cheap, and ideal for what you need.
You do not need to pay any more unless you want PVR (personal video recording) functions.
In this case, i think cheap is fine!
ps. She is also in the Meridian area.