Damp Patch In Bedroom Ceiling & Top of Wall - Condensation

[Cleggshark]

I have a problem with a damp patch on the ceiling (inside a built in wardrobe) adjacent to the external wall of the upstairs bedroom. After a while this is growing dark mould which can be wiped off. There is also a small amount of dampness and mould all the way along the top of the wall outside the wardrobe but nowhere near as much.

I assumed I had a roof leak (even had a cowboy quote me to repair it) and have been in the attic a few times hunting for leaks. Everything up there is bone dry. The roof eaves are similar to the image attached (I am not sure which bits are insulated in the eaves though). I also chatted to the neighbour who tells me he has had the same problem for years and had roofing work carried out with no success.

Having been on this site I now think the problem might be condensation related rather than a leak. You can see from the photos that the loft is very well insulated and the small 2 bedroom house is always very warm. Some of the photos show the area where the leak is when I peeled the insulation back.

So my questions are.

1. Condensation - is this likely to be the problem?
2. Could it be cold air in the eaves condensating against the warmer inner wall? Should I push the loft insulation down to meet the top of the outer wall?
3. Could the problem be too much insulation, or insulation blocking the ventilation? Should I pull the insulation back from the edge of the roof
3. Is the plastic tray I found there to give a ventilation path into the attic?
4. If this doesn't work what else could I do? Vents in the wall, dehumidifier??

Any help is much appreciated.

[OchAye]

It seems to me to be too wet and too concentrated to be condensation. It is as you have water/moisture coming in either from above (tiles) or from the eaves.

You must pull the insulation back from the edges which are meant to be open and let air circulate in the loft space.

[Cleggshark]

Thanks for your reply. Will get the insulation pulled back from the roof and see if I can see anything further.