Water ingress around inside kitchen window

[BathDIY]

Have noticed some signs of what looks like water ingress inside my kitchen window. Have been outside, removed the strips around the window and siliconed back in (which hasn't helped).

I now notice that there are no gaps in the brick joints above the window (which are present on other windows on this part of the property). I believe these allow the water from the cavity drip tray to safely exit the wall/cavity.

Any thoughts? What can I do about this issue?

 

[HERTS P&D]

What's the guttering like, is there a gutter joint above the corner of the window?

Andy

 

[BathDIY]

What's the guttering like, is there a gutter joint above the corner of the window?

The guttering was poor but it's now (late last year) been redone and is fine.

 

[HERTS P&D]

Was it leaking onto the window?

Andy

 

[HERTS P&D]

Draw around the damp mark with a pencil and write the date next to it, then check in 2 weeks to see if it has got bigger or smaller.

Andy

 

[BathDIY]

Was it leaking onto the window?

No not (noticed) it hitting the window itself although I would guess it may have come close-ish in very bad weather (it's a 2 story house kitchen on the ground floor).

I would guess that the guttering was leaking (downpipe blocked) for some time.