The BBC2 show Dragons' Den is now in its fifth series. While the show is obviously edited to entertain (more than anything else) it would appear that few of the current contestants have watched any of the previous shows!
Week after week they come before the Dragons – often repeating the mistakes of previous contestants. This article, Securing Funding - The Dragons' Perspective, attempts to shed some light on the key mistakes being made and recommends some key changes required by future entrepreneurs pitching to investors. Obviously, the lessons here will apply regardless of which finance sources you intend to approach.
http://www.businessplanuk.co.uk/Articles/BusinessPlanMasterClass/Securing_Funding.htm