You could try MK5 Golf GTI UK, they don't allow new users to post in the Classifieds straight away.
I've looked at the ad, if you can try and get some pictures showing the car from further away in the side shots which may help, most are close ups. I would only use close ups to highlight damage e.g Pikey in a Van respray on the wheels.
You could start off advertising on the forums and if you don't get interest then pay for an Auto Trader ad.