Canalsman
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Polyurethane sealant should be used rather than silicon to form a bead around an existing item such as a rooflight.
I suggest that you need to gain access to the roof to examine the existing seal. Ideally the rooflight should be removed, the surrounding area cleaned together with edge of the rooflight, then reinstalled either with butyl rubber sealant as described above or a non-setting mastic.
As a temporary measure, cleaning thoroughly round the edges of the skylight in situ followed by polyurethane sealant should stop the leak.
You commented that the leak stopped when you moved the 'van. That should give you a clue as to where the water is finding its way in, depending on what slope, if any, there was before you moved and after you moved.
I suggest that you need to gain access to the roof to examine the existing seal. Ideally the rooflight should be removed, the surrounding area cleaned together with edge of the rooflight, then reinstalled either with butyl rubber sealant as described above or a non-setting mastic.
As a temporary measure, cleaning thoroughly round the edges of the skylight in situ followed by polyurethane sealant should stop the leak.
You commented that the leak stopped when you moved the 'van. That should give you a clue as to where the water is finding its way in, depending on what slope, if any, there was before you moved and after you moved.