I wonder if M03 was the old Lallemand Manchester - I'm not sure if Manchester was withdrawn around the same time as M03, but it would give a reason to do so. There's been suggestions that Lallemand Manchester had some kind of connection to Scottish & Newcastle.
As for M15, I'd assume it's either Lallemand ESB or Windsor, I've not really played around enough with them to get a feel for which.
iMake was the retail-facing company based in NZ that owned brands like Grainfather and Mangrove Jacks. SPL Intl was a wholesale company in the UK that invented turbo yeasts primarily for making alcopops. SPL then did the repackaging of other yeasts for Mangrove Jacks, and eventually iMake and SPL merged to form Bevie.