Only boil what's necessary, but there's either a little left or not enough and you have to go ith the former as the latter is unacceptableCompletely off topic, I want to talk about Octopus, so perhaps will continue that on the environment thread we have somewhere.
Talking of the kettle, do you fill it or boil only what's necessary ? Swings and roundabouts on that one.

Hugs not Thugs