Well I've been doing some reading regarding Scuttles, Mugs and alike.
And come to the conclusion that warmer lather is always a good thing for a great shave.
I've always struggled to keep my lather warm throughout the whole shave & came up with a ingenious and importantly cheap way of heating my Edwin Jagger shaving bowl without the rather dangerous looking electric heaters.
Having just finished a tub of cereal I wondered if the bowl was small enough to fit inside the plastic tub. It did with great effect !.
I've drawn a line in permanent marker to ensure I don't overfill the tub with boiling water from the kettle, and its still toasty and warm even after 20 minutes.
We'll have to see how tomorrows shave goes!.