How-to instructional video narration

We are currently developing a new version of our visual thinking software - Inspiration 10. Inspiration is a simple but powerful tool for creating mind maps, concepts maps, graphic organisers, outlines and presentations with ease.

Version 10 will launch on the 1st of September. To accompany the software, we are producing a series of how-to-videos. Each will be between 1-3 minutes and there are 58 in the library. These tutorials will be screen captures using Camtasia.

These videos will be aimed at our users:
Students at university
Educators in schools and universities
Professionals in the workplace
3rd party trainers, supporting our users

Requirements
The screen capture videos are being produced to a script, recorded using the author's voice. As well as the scripts, the videos will have captions that have been timed accordingly. The scope of this project is for a professional narrator to re-record the scripts, using the timings of the original recording. The new recording will then replace the existing one.

Please see attached for full brief and video descriptions.