Driving a disco i've found some intersting points with the whole waving culture.
If you have a plain factory set disco, range rover, freelander, chances are you won't get waved at, even factory standard defenders and series get's waves.
If you start putting kit on that can be seen as extras, and therfore linking you to be an enthusiast, then you get waves!
I'll wave at anyone, although if i see it's road standard with female driver, +/- kids, well dressed business man, sometimes i do't as you get funny looks!!
If in doubt, Wave!!
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