Opening the window was indeed a tongue in cheek comment on reducing condensation if leaving the bath water in until it dropped to room temperature. But that is the reality because it makes the bathroom too moist IMHO. But I was just thinking if I cut something like a bin bag to the water surface outline then the heat could escape but condensation wouldn't while the plastic floated on the surface? I'll try that next month.
We currently have a cheap, lightweight plastic kettle so combined with the £30 flask is not expensive compared to an insulated kettle. The biggest benefit that still makes me smile to realise it is I'm not waiting for the kettle every time I make a brew. A full kettle is two brews in the flask for later and one mug full now.
But it seems I've been making tea wrong all this time from Chris152 so I need to buy a temperature varying kettle immediately! How long will another £50 on a kettle that does that take to pay for itself if I only heat water to 80 dgrees C instead of boiling?
Another thing I do is always have a super strong filter coffee in the morning plus a tea. I make them both at the same time, the coffee using an MSR mugmate or the equivalent cheaper knock off filter in the mug. That goes in an insulated mug so that by the time I've finished the tea the coffee has cooled to just right
I did buy a Melita coffee maker with an insulated pot which works well but doesn't make as nice a drink. I also discovered that I shouldn't have that coffee before going to the Drs because otherwise he thinks my blood pressure requires medication!