Was it on finance or a bank loan, never mind I don't care really......Do a finance check via Cartell with the reg number, if it comes back with finance on it that is yours then you need to clear it post haste as you will have sold a vehicle to an innocent person who will likely have it taken from them, expect hassle if that happens.
You should have cleared the finance or loan before disposal, never mind making any other excuses or arguments, you knew you owed money on that car, not a nice thing to do Kerrigan, and that my friend is putting it to you as nicely as I can on this site, I would like to be stronger expressing my views on that to you, it is the lowest of the low and as your post indicates you only care about yourself now but there may be implications for the honest purchaser you may have duped especially if finance is outstanding on that vehicle.