I ended up culturing this up and using it in a brew. It's unlike any yeast I've used before. It's fermenting in a clear FV, the krausen doesn't look normal and I thought the batch was infected. I tried some, it's not infected and tasted amazing! Took a gravity reading, OG is 1.050 and current SG is 1.003, which is something like 94% apparent attenuation. I'd be surprised if it ferments any lower.
It's been in the FV 3.5 weeks and there's still a white krausen on top. I'm thinking this is might be a blend of saison and maybe Brett? My sample had strong honey flavour, with some earthy tones and hint of pepper. It wasn't the most saison tasting beer I've had. Malt bill is 5kg Europils malt, added a lot of sorachi ace late in the kettle but it hasn't come through at all, but I think that's more to do with my water profile.