I like it. Short, to the point, and backed up with links to examples.
One suggestion I'd make is to be more consistent in what it is you pitch. You've used the terms "User Experience Testing", "UX testing", "Usability testing", "User testing" and "UX" at various stages to discuss what it is you're proposing. This might confuse matters and hurt your chances of it getting approval. Pick one term (I'd suggest "usability testing") and use it throughout. There's probably not really any need to introduce the term UX at all. You may even consider using the term that Jakob Nielsen uses for this, and that's "budget usability testing". This sounds cheap (good if you're struggling to get funding for this activity) because it is. Plus it may allay any concerns that someone whose only experience with usability testing is in an expensive lab with eye-tracking software may have.
Also I wonder if an image might help—a photo showing someone using a computer while a helpful facilitator watches over. There may be something on a stock image site. It's not that important, but it just struck me that the slides are a bit text heavy, and if the audience is someone skeptical of the idea of usability testing then bringing it to life with a visual that shows it's not all that hard may help.
I hope that's helpful, Paddy. Best of luck—let us know how you go with it!