It just wasn't to be !!
This morning, the V70 started making a high pitched whining/whirring noise. It stopped as the car got up to operating temperature.
I suspect the alternator, but obviously without going into it, I can't be sure.
So, I'm going to take the car off the market until this problem is sorted, and I don't know when that will be.
I'm definitely not going to try to sell the car on with the problem, that's just not me.
Sorry to those that were interested.