A business plan is normally written for an "internal" audience to guide the efforts of the business owners and managers. The bank is an "external" audience, so the executive summary has translate the plan into a clear, yet brief and concise snapshot of your business operation that anyone can understand. In effect, it is to your loan request what a movie trailer is to a feature film. So it's not only WHAT you say in that one-page summary, but HOW you say it.
By "grabbing attention" I meant a banker has to look at the executive summary and be able to see in about eight seconds that you know what you're doing and that all the detailed answers to his/her questions regarding your business, your people, your customers, the loan, its use, its repayment, etc. are going to be well-documented and fully explained in the package somewhere. The executive summary doesn't get you the loan, but it does help ensure that someone actually READS your plan and LISTENS to your business case.
It appears from the dialogue in previous posts that you've already contacted and are working directly with other consultants on this. Any one of them should be able to guide you on the format and content details, and give you some winning executive summaries they've prepared for other clients as an example. Best wishes!