Another thing is the heat as well...not such a problem in Winter, but in the middle of Summer it gets bloody hot in a car boot...my Dad leaves his work laptop in the boot of his car all the time and I'm surprised the heat hasn't damaged it.

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Definitely. I left a Dell Optiplex (covered in black plastic) in the back of the car for about 2 days (in the middle of summer, in Melbourne...) and when I went to collect it it was little more than a warped mass of black and grey plastic. Another issue is that with the older macs, moving them from a hot to cold environment constantly causes the plastic to brittle - hence my beige Plus cracking in several places when I went to pry it open! Weather and computers don't mix...