1mm are generally used for wiring lighting switch wires, heating controls and other electrical controls which don't require large switching currents.
Tails such as 6mm are used alot for connecting sub-panels or fuse boards for garages and showers.
The inner PVC insulation is either Brown (Live) or Blue (Neutral) with a secondary sheath of Grey PVC.
At the connection point on the supply meter the outer grey PVC is generally cut a few mm short so as show the inner colours of Brown & Blue.
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