Aye the Polo is a nice little car. If you're not a badge snob you could get a Skoda or a Seat. Same car, different badge. You can always spunk the saved money on, I don't know, some saucepans you can't break?
Hmm... selling. I don't know about over there but over here the second hand market is dead. Too many cheap cars for sale already so if you try to sell one there are hundreds more to choose from. Kinda why I like mine as if I ever sell it it'll be worth more and buyer will be queuing up for it.
Try the local rags is the best bet. And any car magazines you have out there. You could put it on
eBay but it'll go for less than it would anywhere else. But could be the best option if you want a quick sale.
You can never stop time wasters. But never let anyone take it out for a drive unless you or Adrian are in it as well. And if there are two of them make one stay at your house with one of you there as well. If they don't like that then tough on them.
Oh, and when you do sell it date and time the reciept you give them, keep a copy, put on it "sold as seen" and get them and you to sign it. That way if they get a ticket on the day you've sold it they can't say they bought the car after the incident and they can't come back to you saying "the brakes broke, you owe us money".