Condition of roof

[Fizzipop]

Hello from a newbie - apologies if this question is seriously elementary.

The felt along one edge of this pitched roof looks like it's lifting off the far side, instead of sitting flush. Does this matter, or will it need replacing?

Please see these zoomable pictures:
http://extrazoom.com/image-3957.html
http://extrazoom.com/image-3958.html

Thanks.

 

[noseall]

I can't see any felt lifting only a gap.

Oddly, there seems to be a partial top course of tile hanging (5 tiles) beneath the lead flashing then nowt. I'm wondering if the gap is where the others have fell off?

I doubt the drop on that lead would be enough to weather the head-lap without a complete top course of tiles

 

[dann09]

I agree with the well spotted above. Definitely odd.
Plus, a bit lower down a tile is slipping.

Why felt on a pitched roof? Is this a Dormer?

 

[RogerBoyle]

It looks like they have put a partial course of tiles on LOL unless as said they have fell off
You are also missing a tile on the left hand side of your window at the top

 

[Xenon]

Felt and lead detail is standard for a flat roof onto vertical tiling. Looks like they forgot to run the batten across the window, and I suspect the additional tiles are covering a hole up. To much cement in the mortar too which looks like it went in via catapult.