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@andos
It leaks when there is North West wind which would force rain against the new flashing /wall section near the ladder in the pic.
I was up there yesterday doing exactly that and trying to replicate the same wind direction but couldn't get anything coming through.
Also just been up there for ten minutes specifically at the flashing with a hose against that section at different angles and it's not produced anything.
@TW this is the problem. Its not going to be in an obvious place and to make matters worse there are two layers are gyproc on this roof (was re-insulated at some point) and there is a plastic sheet under one layer. So it could be literally anywhere and running along the plastic sheet until it finds the lowest point.