Darren Birks - 28/09/2018
Actually you are right it was the hit squad release. It had a small sticker on the disk saying STe compatible which covered the Hit Squad logo leaving only the copyright message at the bottom of the disk (the original developer) so that explains that. :)
We really need the disk scan to verify this. Every other Fun School 2 series titles we have comes with two single sided disks and all three titles were made in 1989 according to the advertisement. Like many pre 1990 STOS titles they also don't run on the STe, but this one does. That's why it sounds more like a budget release (or a double sided update of the original release).
See this for example:
Darren Birks - 25/09/2018
If this is version I uploaded yesterday, it's actually the "Database Educational Software" version and not the budget one.