For the cost of an ebay classified ad its definately worth trying, get a ball park figure from one of the online car buying services (be scrupulously honest in describing) to give you an idea of base line value.

Plenty of pics, itemise the big selling point that FSH by listing date and mileage of services, overprice it a bit to give haggle room but not too much to disinterest people, have a figure in your mind you won't drop below ie that £2200, so long as you have £2200 in your hand at the end, you can then get some money knocked off the next car (unless you are buying from a car supermaket which are usually fixed prices.

Alternatively if your car is a good one (and the A3 is a good looking popular car, what about advertising it at work or somewhere you go regularly at that £2200 trade in price, everyone's a winner, no selling fees to anyone and no odd strangers contacting you.

It depends how much you value your money and your hassle-time. Selling privately can be worth a grand or more to you, because that is roughly what a trader will need to cover his costs, risk, and to make a profit. An ad or two is always worth a try - if you are unlucky you still have a fall-back position.

On the downside is the time of year and the current anti-diesel feeling. The upside may be the Audi badge and the FSH. Give it a try. Remember that pricing can vary quite a bit across the country, so keep your comparisons fairly local.