Secret Gutter and Flashhing

[Drew1000]

I am building a small apex porch roof above my door. Planning on finishing the roof against the house wall using a secret gutter extending onto timber roof.  My (small) tiles can finish almost touching the lead upstand or could be stood of by xmm.  I have cut a groove for the lead flashing either side 100mm above the tile line to allow for the secret gutter upstand.  When I have completed the tiling does the flashing which will come down from above be dressed into the secret gutter and trimmed or does it extend onto the roof on top of the tiles completely covering the secret gutter channel.  Hope that all makes sense and thanks in anticipation of any replies.