There's quite a lot of double-insulated equipment about - power drills, strimmers, mowers, etc. The garden equipment, in particular, often has a fairly long lead attached (5 - 10m). When the equipment goes south and can't be repaired, I usually cut off the lead before taking the remains to the tip for recycling.
I'm getting a small collection of leads, usually orange coloured but sometimes yellow, which can make useful extension leads for strimmers, etc, when a plug and socket are fitted. But, being twin-cored only, they aren't of course earthed and that makes them unsafe to use with equipment which has to be earthed. Other than scrawl in indelible pen on the plug and socket "NO EARTH", is there a better way of limiting the use of these extension leads?