Begonia Rex "Escargot"

SC what did you do with your leaf, that was so successful?

All I did was slice the leaf in several different places across the veins. Then just lay it on a pot of compost. As I didn’t have anything suitable to pin it down. I held it in place with some small stones. It’s just to make sure the leaf has contacted with the compost. Then I put it in the heated propagator. As things are warming up you might be ok with an unheated propagator or a cloche/plastic bag over it. 
mine is out of the propagator now.

Basically I pretty much did this https://www.gardenersworld.com/how-to/gr...-cuttings/
Which is the link Veggie posted just after our leaves arrived. You probably missed it. As you had far more important stuff going on at the time.