Scenario: Starting at the dawn of the 19th century all prideful subjects of the crown are galvanized with nationalist lust to get a living human on the moon. They seek to do this at all cost even if that means making it a one way trip. Can they do this, and if they can what is the earliest time they succeeded?
Scenario 2: the British people have tempered their expectations and just want to get their flag on the moon in any form.
A confirmed message from God?
If it’s provable then we go to the states and let them know god needs us to colonise the moon. We let the rest of the Christian world know too, most likely prevents both world wars.
Considering how long it took from flight to the moon I’d say we can bang it out before 1945 honestly. This is assuming that all the energy we put into war gets transferred to getting to the moon.