While I'm sure that no-one is especially interested in my personal sales journey, I will share my conclusions after attempting a private sale.
I stuck the car on autotrader at their recommended price of £3550.
The first caller was a man from a nearby town interested in making a purchase, he informed me. Yeah, bruv, what it is like yeah bruv innit I want to buy your car yeah innit bruv. He said he would call later in the week to arrange a visit.
The second caller was similar: yeah mate what it is right bruv, that I want to offer YOU £1200 for your car, bruv. After I informed him that WBAC had offered me £3000, so I in no uncertain terms rejected his generous offer, he grudgingly raised it to £1400, amongst a further plethora of yeahs, bruvs, innits and 'what's your best prices'. The next day he phoned once more to offer £1550, at which point I blocked his number to save myself from further nonsense.
The first man called later and I had a discussion with him. He claimed to have recently passed his test, but betrayed a disturbingly high level of knowledge about car dealers and WBAC. Nontheless I agreed that he could come and look at the car.
In the interim, I visited WBAC, who went over the bodywork with a fine toothcomb, knocking £60 off here and there, along with two lots of £127 for a couple of scratches beneath the front and back bumpers. I suggested that their price of £2600 was not sufficient, at which point the salesman unsuccessfully attempted to haggle me into selling it with a slightly increased offer (I later discovered they are on some sort of commission for knocking down the price).
By now I had sufficient concerns regarding the first gentleman that I sent him a text to let him know that the car was sold, even though it certainly wasn't. This seemed to upset him for some reason and he sent me various texts in reply asking how much I'd got for it, which I ignored. He followed up with a phone call at 10:30pm when me and my wife were asleep, followed by further text messages asking why it was still on autotrader. I then blocked his number.
With the insurance on the car due to expire the following day, I took the car to Evans Halshaw. As I'd hoped, they looked at it as a smart, high-spec Nissan Note that would buff up nicely and shift off their forecourt in less than a week. I sold them the car for £2949, which I was content with all told.
CONCLUSION: This is why you don't see many private adverts in autotrader any more. The time wasters, griefers and tyre kickers still exist, but they have fewer private individuals to badger, so you stand a higher chance of encountering one.