Selling a car with finance on it...question

[Mcbeth]

Basically, my wife's car is the first car we've ever got finance on so I've not done this before.
Come January, we want to get something a bit bigger and I'm happy to sell privately.
By then, there will be about £2500 remaining on the finance but the car is worth at least double that from a dealer or a private sale going on similar spec/history/ mileage etc.

I simply have no idea around the legalities around this.
Can I sell a car with finance on it assuming i pay it off as soon as the money is in the bank?
I need the wedge from the sale to pay it off so is it a catch 22? Or chicken and egg etc?
Am I obliged to tell the prospective buyer that it has some money left on it?
Any pointers would be much appreciated

[Mcbeth]

Thanks for the tips, I hadn't thought about paying it off with the credit card first....that's the best thing I reckon. Definately best to avoid the new buyer getting involved.
Cheers