Thank you for your input guys, its much appreciated, genuinely.
This Z4c will be going alongside an existing weekend car, so as mentioned I'm no rush and happy to wait for one that fits the bill (No pun intended). I have seen a few reasonable examples on here going back over the last few months, most seem to of sold to a trader, but its good to see they do seem to exist!
With regards to the maintenance and documentation, for me it comes down to the cars value. If its a highly priced example, I would expect it, if its a cheaper example then its genuinely not so much of a problem.
However, this is generally a big thing for me as it shows the car has been well cared for throughout its life. Yes, having low mileage is great, but with these cars being over 15 years old now I do get put off when I see quite a few owners on the V5 yet only minimal basic service receipts. Mainly, as I see myself being the one having to carry out the necessary's over the next few years.
We're all different. I appreciate that you can carry out maintenance once you have found a good example, But, I'm not usually one to pay high end for an example which will inevitably require money being spent in areas which other examples out there have already addressed.
Sorry if I waffled on, hopefully you get my drift!

Love these little gifs, reminds me of the forums back in the early 00's.