Put the sensible hat on a flog the Zed for something more practicable, you said youself the Zed is being used less and more likely so with an alrounder car. You just need to ask yourself if you can stomach the cost of a car sitting on the drive doing nothing, sounds from what you have said it would bother you. Personally it doesn't bother me, Z3 gets used between Nov to March and the Z4 the rest of the year, I don't think of the costs of an idle car, if I did I would only have one.
Tim.
Tim.