Sorting cells and deleting duplicates except for first instance

Hi There,

I am looking to create a formula or set of formulas that sorts two sets of Data (Start & Finish Times) and then deletes duplicates, except for the original data. I have attached an example spreadsheet of my solution so far, it's almost there, except that my formulas are deleting both instances of the duplicate (the original and the duplicate). I have included more information in my spreadsheet on what my formulas do.


Thanks for any help you can provide.

Dan