Hello Sean,
I work as a Bussiness Analyst for Corporate Spend, and am involved with a couple of projects in that sphere. My writing skills are second to none, and I do know what you are referring to when you speak of a business plan- the components therein, and the buy ins to target.
Should you so require, I can PM my credentials, writing samples as well as an outline for a Business Plan.
I can be available 5 pm GMT on any given day, on Skype if you need to converse, or any messenger like yahoo or MSN.
Please let me know which time is convenient for you, keeping in mind that I am based out of India.
Thank you.