100 pounds a license? Is that for a lifetime license, and what are the terms of the license.
Are you therefore going to be selling multiple licenses? If so, does the first person get the domain? Or are you charging extra for the domain? Licensing scripts out means that the script is not unique when it is received.
You may want to revise your marketing and selling strategy. Licensing out scripts is usually a better way to make profit from the hard work you've put in coding, but doing so will take away the uniqueness.
Good luck with the sale.