damp patches in loft - flashing need replaced?

[garya]

I have some damp patches in the corners of the ceiling and on the walls of my loft, i've had a look out through the velux window and taken a few pictures, there looks to be gaps in the lead flashings in places like the lead has shrunk and it looks to be corroded, not sure if this is the cause, looking for some guidance from the experts and a rough estimate how much to put it right. Many thanks.

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[Leadman]

Hi, the soakers under your flashing do look a bit low in places, but really you need some one to come out to look to tell you as i would just be second guessing from the photo's.
Also on the third photo it looks like theres a hole in the slate in the middle! any way id call a local roofer.
Hope this helps
Dave