roof leak cause

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I have a slowly worsening leak on the top room in my house. The house was built in 2003 with a study in roof space of the house. Several years ago a faint mark appeared on the inside slope of the roof(highlighted blue). A year or so later, marks appeared above the 2 windows and then more recently significant shadow marks appeared near the chimney (highlighted red). This has spread and damp readings show figures of between 15% and 23%.

I have called out some roofing guys and they have taken a look and applied some sealant in a few places but this has not helped at all. I have used a drone to take further pictures as attached but these don't really seem to show a clear cause. There does seem to be some faint cracks on the chimney and a few marks but I'm not convinced these would explain marks of this extent.

Any suggestions of what to do next or possible causes would be very gratefully appreciated.
 

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Gas stove @ the bottom of the chimney and a gas vent used on a flexible flue liner on the top of the pot ?? And a green moss ? ring around it. I would say that's where the damp is getting in . You need a Registered Gas Safe engineer to ascertain what the gas terminal is doing. Seems odd to vent a cooker like that But safety First round gas !
 
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I’ve probably not used the right term, it’s an old fashioned looking gas fire and we have not used it for probably a year as we have central heating.

Gas stove @ the bottom of the chimney and a gas vent used on a flexible flue liner on the top of the pot ?? And a green moss ? ring around it. I would say that's where the damp is getting in . You need a Registered Gas Safe engineer to ascertain what the gas terminal is doing. Seems odd to vent a cooker like that But safety First round gas !
 
Fair enough but it still wants the GS engineer, maybe remove fire and liner then let the chimney breathe. I thought it was a stove in a fireplace alcove in a kitchen;)
 
Same train of thought as nige, i would replace the gc1 terminal with a Gc2 clay terminal...but that would be down to the gas bod.
 
the flue (how many fire places do you have below?)) must not have ever been swept?
there's amounts of flue soot condensate seeping through your chimney stack - on the outside as dark smudges, and internally as damp stains.
given the 2003 age, & the use of a gas fire, there must have been a heavy use of solid fuel (wet wood?) before the gas fire & liner were fitted.

compounding the soot problem there appears to be moisture leaking into the chimney breast & stack.
streaks can be seen from the terminal top to the smooth stone of the stack.
a 2003 build should have built-in stack DPC. i doubt yours has one?
the flashing appears to be fine except that the lead saddle should have extended further along the ridge tile.

the flaunching is fraying at the edges - and is there an adequate throating (about 50mm) in the flaunching projection?
the metal terminal installation is pooling water.

best practice would be to erect a tower, & remove the terminals and flaunching down to stonework - then remove the SS liner.
then sweep the flue(s?).
Re-build the flaunching (use SBR Latex in the mix) and terminal after determining the future of any fireplace appliance/liner.

Or you could simply remove the liner, sweep the flue, and soak the flaunching with a "water proofer" - & a correctly installed flue terminal?

all damp stains in the bedroom will have to be hacked off or cut out -
perhaps read, fwiw, my previous posts on dealing with c/breast damp etc?
 
That chimney looks like it wont have a DPC, and it should have.
 

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