Cheap taxed and tested car (£800 Max)

[Ro55H]

Anyone know of cheap car forsale in our area as i need a car to get out and about in during the winter months? Must be cheap to insurance and economical. I'm thinking Ford Ka or VW Polo. My parents went to look at a KA up in Durham today after been told the car had 1 owner and 61,000 miles on the phone and turns out could be 3 plus but the seller didnt know and had nearly 80,000. So just want a genuine honest cheap car.
Thanks
Ross