Got this fallen cement. Where are they from?

[hgdiyuk]

Hello, I’ve found two pieces of fallen cement. Could you tell me where they’re likely from? Should I be concerned about a roof leak, for example? Many thanks.

I can upload more photos if these two are not clear.

 

[StephenStephen]

I suspect it's gonna be a bit tricky to guess without any clues, maybe even a picture, about what's above them...

 

[freddiemercurystwin]

Ridge or a hip probably, best go out in daylight and have a look .....

 

[hgdiyuk]

It’s a bit tricky to check unless I climb up, so here’s a photo of the roof.

Could be between the ridge tiles?

 

[foxhole]

Some missing from top of leadwork on chimney ?Though don’t see a reason for it to be there.

 

[hgdiyuk]

The chimney was repointed before, as you can see from the lighter colour of the mortar, and it looked fine.

I will try take some better photos of the roof tomorrow.