Rather confusing that it used to be the Leaf 40, now it's known as the Leaf 39 (which is the EV Database useable figure), if usable is 37.5! Not sure quite what's going on there.The LEAF 39 has 37.5 Kwh available when new expect that to reduce to 35Kwh at 3 years old with battery degradation.
Expect 150 + miles range in warm conditions and 110 miles range in worst winter. conditions.
The Leaf 39/40/37.5 will beat a Corsa in some respects and in other respects be beaten by it, so seems like a sideways move. As long as that is accepted, no problem.