Don’t be annoying or anything, but things like photo copiers in reception areas. They’re hardly ever used, but left ready to leap into action. The colour printer in an office I work at is rarely needed, but it’s always on. I switch it off, and it’s often several days before it’s been switched back on again. Unnecessary lights left on in offices or waiting areas. If you switch them off, people will switch them on when they need them. Let’s look out for things we can switch off that aren’t being used regularly (don’t irritate anyone!)