Lead flashing into pebbledash

[Rover1]

Building an Edwardian conservatory and not sure how to flash into pebbledash (pd). The run is half brick and half pd. I am OK with brick, stepping small sections of lead following the course of the rafter but what happens when I get to the pd? I think I have several options:
Should I expose the brick and follow the same pattern, replacing pd down to either the top of the lead or the bottom of the lead or;
Should I cut a groove into the pd and feed the lead flashing into the groove?
I would appreciate any views and comments.

 

[masona]

Cut the groove into the pebbledash and lead flashing into the wall the normal way, then cut the pebbledash above the lead flashing approx 2" then fix a Angle Bead Galvanised Render Stop over the lead flashing and make goods with pebbledash.

 

[Rover1]

Thanks Masona