Script for 50 Second Animated Explainer Video

Num. of words: 180
Topic: SEO Company
Tone: Other
Extensive research needed: no
Extra notes: I own an SEO firm and am looking for someone to write the script for a 50 second animated explainer video that'll be created as soon as the script is ready.

I'm looking for a conversational, personal tone.

Here's the sort of script I'm after:

http://vimeo.com/63082709?
http://www.youtube.com/watch?v=AXuNI-np6Ig
http://www.youtube.com/watch?v=JZAMG2L3F5Q


I already have two versions (if you want to take a look) created by one of the bloggers here at the company but they aren't quite there yet - needs a professional script writer's input.

Along with your proposal please attach a few examples of previous work.

Not sure if this matters or not - the voice over will be done by a British male.