attaching lead and coping stones to external cavity wall

[KGC]

Hi can anyone help me. I need to seal the top of 2 external cavity walls with lead and coping stones and I do not know how to do this... The wall is 250mm deep (the cavity) 3000mm wide, 3009mm tall where the wall attaches to the house and 2475mm at the front (I have attached a photo to show this) they are the walls for a new lean to conservatory. The lead is code 4 and the coping stones are 350mm double weathered. Any advice will be gratefully accepted as I am stuck!

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[Alastairreid]

Run a strip of dpc down the cavity then bed your copes.

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[KGC]

Thank you but what about the lead? The conservatory company have requested this so I'm afraid if I dont use it they won't pass the work...