Why Britain does not invade Norway first

What would Norway's reaction be if Britain invaded first?

Britain would face much the same political danger as Germany, so a pre-emptive invasion is not a safe route to the scenario.

A British invasion would be dangerous because it would violate Norwegian neutrality and provoke a hostile reaction. Although figures such as Churchill pushed aggressive options, military institutions could slow the process and give more cautious voices time to prevail. Britain could lose the political advantage needed to turn Norway into an ally if it became the aggressor. The counterfactual therefore rests on Germany making the escalation.