I am running this project as a pensioner, living alone. I am married but my wife is not participating, so sometimes we share a meal and I account for my half. As a pensioner I do not benefit from a works canteen that might have provided my main lunchtime meal.
Nonetheless I might have walked to a nearby “British Restaurant” for a cheap, filling meal. These restaurants were set up specifically for that purpose. When I was a child in the 1950s my first school was in the premises of a former British Restaurant.
Thus I am starting with a bigger challenge than many would have had in the 1940s.
I will of course be fulfilling my Home Guard, ARP or Fire-watching duties at night, so I need to eat heartily!