Bought mine in January for £12k. Whatcar.com value it at £10k for a trade in or £10500 private. I don't know if I could actually get that, but I wouldn't be too disappointed if I did.
if you want a true value on trade (renault may offer slightly more if your getting other renault) go to http://www.weneedanycar.com/ it's more realistic than the others and i've done some searching!