Why did Britain win the BoB?

Why did Britain win the BoB?

Let us imagine that we are going to be playing a complex wargame
assigned to us some 3rd or 4th year military science course. There
are 20 classmates. Each will have to write a report from either
GErmany's or Britain's perspective, and the grade will determine your
standing on your team when the game is played.
The Battle of the Atlantic is open to play too. In addition, any
commentary on any matter could boost your grade. Such as commenting
on mass communications then and now, or anything that seems intersting
and anytime relevant to military studies.

The setting is July 1st, 1940. What must the Axis do better? And
what must the Allies do better?

To me it looks like Germany can improve a lot, and Britain only a
little bit. It is easy for the Axis team to create a shopping list of
things to do better, or more, or less, but what can be put on the
Allies list?

John Freck