The bottom line is usually how significant the saving would be.
If you are saving £20 a quarter by being constantly vigilant, then is it worth it?
Turning the central heating down and putting on an extra jumper might save money, but what if I prefer to pay a bit more and not wear an extra jumper?
If you go the whole energy stingy thing then unless this is a hobby you enjoy you can blight your life worrying about such stuff.
I don't think the savings are going to fund an annual continental holiday; they may fund an extra bottle of wine a month if that. If you can already afford that extra bottle then is it worth the effort?
Cheers
Dave R