Having the same issue mate, sold my Scirocco the other month and had endless low ball offers (£13k and offering £8k WTF!) why call about a car if you have no intention of offering anywhere the asking price.
Genuine couple came round and bought it though for £12,700.
Now got the misses A1 up for sale and had two calls, one was a lad offering £8,500 over and over on a car up at £10,500 - we buy any car offering £9,500 so £8,500 was a joke.
Then had someone have someone come and inspect it, turned out to be 'The Car Buying Service' and to be fair, they offered £9,800 which was great, but then couldn't get to them in the week and didn't want to hand the car over at a weekend and not get paid until the Monday and cant get to them for a couple of weeks and they wont hold their price.
Other than that than, no interest in 2 weeks!! It's well priced, clear pics, clear description so I am stumped.