Overseer

Western Thunderer
Swept valleys are the most likely from the look of the building. I thought I had a good illustration in a roofing text book but can't find it. A google search for 'swept valley' wall find plenty of examples. They will be fun to make, trimming the slates to shape.
 

Peter Cross

Western Thunderer
The hips look like a butt joint, with a lead cover over the top half of the tiles, under the covering courses. Can be done with slate but not very water tight.

Edit to add missing parts.
 
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Overseer

Western Thunderer
Looking good. As well as swept valleys, they look like mitred hips in the historic photos. Unlikely to be any lead or other metal flashings visible on the roof. The underside of the slate was probably parged, and mortar flaunching will be visible at abutments.
 

Pencarrow

Western Thunderer
Looking good. As well as swept valleys, they look like mitred hips in the historic photos. Unlikely to be any lead or other metal flashings visible on the roof. The underside of the slate was probably parged, and mortar flaunching will be visible at abutments.

Thank you for your reply, it all helps point me in the right direction. I did however have to look up parted and flaunching!
 
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