Hugh,
Stephen is right.
For this kind of message, it needs to be short. :30 seconds or less is best.
No matter how brilliant your message, if it goes longer than that, a LOT of people will just hang up.
I would:
- Establish why they called, and give them a true fact they cannot argue with: "Thank you for calling..." (that's true, they did! And you've established a tiny psychological bit of credibility with them now...because you told the truth...Silly? Maybe. But I'll take any edge I can get.)
- Reassure them this is painless: "You're less than 30 seconds away from getting your free report Imentioned in the Yellow Pages Ad.." (reassurance plus more truth...)
- Tell them what to do, and make it as little effort as possible: "At the tone, just leave your FULL NAME, and YOUR EMAIL address...and I'll send you the report..."
- Then I might do a quick recap of the top benefit: "The report will tell you how to make up to 300 times the profit you make now, by making simple changes to your ad copy."
- And I would once more tell them what to do: "So right now, when you hear the tone, just leave your FULL NAME, and YOUR EMAIL address...and I'll send you the report...you'll have it i just a few seconds."
That may not be the exact copy you want to use, but the framework is sound. The keys:
1. Short.
2. Benefit driven ("How do I get my free report?")
3. Low effort, low threat: "Just leave your name and email..."
4. Clear instructions...
Hope that helps.