Your comments

Completely missed this, thanks!
Hi Rafal, no offence, but it's a pretty poor solution! As standard, any table I create is allocated to ON PRIMARY; to then make the user go in an change everything to [ON PRIMARY] feels a little too much like additional effort for the user.

Also, I can't see an option to change this for indecies..? They're output as ON PRIMARY too... Perhaps an option to set defaults is required?
In that case, what about a change to the business model to allow users to view only for a pound or something similar, that's attributed to the creator's account?

I would struggle to use the "share" functionality as a work tool if I can't show the diagram to anyone that wishes to peruse it without them paying a membership fee...