Watch the gutters while it rains
Overflow and water running behind fascia are easiest to understand while they are happening.
Check the loft after a cold night
Widespread droplets may be condensation rather than a roof leak.
Look around after strong wind
Broken fragments on the ground or a changed slate line can reveal movement.
Want the problem checked properly?
If you have a photograph from safe ground, include one that shows the whole area rather than only a close-up.
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