Ah thanks guys! You're gonna make him blush :D You'll be first to know when the fry are sellable :)
So a quick update, no swimmers yet but I can see the eyes and tails on some of the eggs. They might start hatching over night, that would be a nice thing to wake up to! Senshi has been wonderful, I've never had such a well mannered betta. It doesn't look like he has eatten any eggs and he hasn't even attacked the snail which was literally in the nest for some time... I might leave him with the fry for a few days.
Here is a video of Senshi and Hanabi flirting :)