kalmar wrote:
Normally your insurance allows someone else to drive your car with your permission
Not quite.
The other person must also have a similar clause in their insurance, and I believe your insurance is basically irrelevant as long as the car is covered. There doesn't need to be anything in your insurance stating this.
For example, my insurance specifically states that I am allowed to drive any car under third-party cover only, as long as I have the owner's permission.
Before I turned 25, my insurance specifically stated the opposite.
Advice:
Ask them to bring proof of insurance with them. No proof = no drivey-drivey. Depending on the car I'd take this further and say that they don't get to drive it unless they can prove that they can pay for the car should they crash it on a test drive.
Payment wise, cash is best (but check the authenticity of the notes). Cheque is also good, but buyers probably won't like this as the money takes time to clear. In these modern times you can always ask them to pay by PayPal (if you're OK taking the percentage hit) or something. Or a direct bank transfer, of course.
Make sure you give them a receipt to show that they've paid for the car. Keep a copy yourself, and make sure you write SOLD AS SEEN WITH NO WARRANTY on the receipt just to cover your arse. Sign and date it.