I use about the middle setting on my mower, but the two most important things are don't cut it so short that the roots are exposed, and don't cut lots off in one go. Little but often is best. Some people say let it get a bit longer in drought conditions but mine pretty much stops growing if we have a drought.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Skunk will get you very high.
For information about lawn height scroll down to the section on watering your lawn.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.