And I am saying I think this is presumptuous, as it doesn't match my experience.
I would argue based on experience that I would expect people in London to have been exposed to more cold than the average Norwegian.
By all means, it's worth checking, but my point is that if you don't find a difference, the logical conclusion is not that cold does not work, but that people in colder places don't get that cold.
EDIT: I would also argue that proper heating has been around for centuries, not decades. Regulating temperature down is a lot harder than regulating it up. In fact, the house I grew up on was a log house heated in part by a wood fire during winters - we used electrical ovens during fall or spring, but the wood oven could easily dump far more heat into the house in a very short amount of time, because it heated up a large stone chimney that was exposed in all the main rooms. But even a tiny cast iron oven can heat up a small house in no time if it's decently insulated - Norway's best established current cast iron oven manufacturer is over 160 years old. My grandparents cabin is heated that way, and you'd get it from freezing to room temperature in less than half an hour.
I would argue based on experience that I would expect people in London to have been exposed to more cold than the average Norwegian.
By all means, it's worth checking, but my point is that if you don't find a difference, the logical conclusion is not that cold does not work, but that people in colder places don't get that cold.
EDIT: I would also argue that proper heating has been around for centuries, not decades. Regulating temperature down is a lot harder than regulating it up. In fact, the house I grew up on was a log house heated in part by a wood fire during winters - we used electrical ovens during fall or spring, but the wood oven could easily dump far more heat into the house in a very short amount of time, because it heated up a large stone chimney that was exposed in all the main rooms. But even a tiny cast iron oven can heat up a small house in no time if it's decently insulated - Norway's best established current cast iron oven manufacturer is over 160 years old. My grandparents cabin is heated that way, and you'd get it from freezing to room temperature in less than half an hour.