PowerPoint 2013 - set default font for text box in slide master

[weety]

I want to set the default font that is used when somebody creates a text box. This needs to be in the slide master as this is circulated to many hundreds of people and I do not expect they will update the font manually

[JohnWilson]

Doesn't actually need to be on the slide master (but can be)

Try this:

Insert a text box (slide master or just on a slide)
Set it to the style you need.
RIGHT click >>> Set Default TextBox
Delete it again and SAVE.

[weety]

Many thanks