Noticed a slight leak/damp patch in driver side headlining after the recent heavy rains so rather than chase my tail trying to find where it might be coming from i thought i would try a slightly logical approach to finding it. I first taped up the sunroof joints using waterproof tape then covered the roof rail trims using the same method, this was to stop water getting through if there was one or more areas that were leaking( my inkling was that it was coming in through where the windscreen met the roof on the drivers side) i then got out the hose and start drenching from the bottom of the windscreen up (with a mate sat in car looking at the area where the damp was previously) when i got to the top left ( looking from the front) my mate noticed a drip ( not me i hasten to add ) I then dried off the screen and trim area, then applied waterproof tape to the screen top trim and and A pillar trim joint, then removed sun roof tape and hosed it down for a while and no leak and lastly removed roof rail tape and hosed it down and no leak, therefore it looks like the only place it was leaking was under the screen top trim. So firstly I removed both A pillar trims and then pulling (gently but firmly) the top trim from the drivers side it slowly came off and I only broke one clip in the process. I cleaned all around the gap between the top off the screen and the roof , there was a slightly rusty area that looked like the source of the leak so I rubbed it down with with sand paper cleaned the area again and applied a rust cure, then applied black windscreen sealant all around the screen where it meets the body , put the clips back on the little pegs on the roof then pushed the top trim back in and lastly the A Pillar trims, I waited a few hours for the sealant to cure then hosed the screen down AND no leak, then hosed everything down and still no leak ( for now at least), I ordered more trim clips just in case i have to remove the trim again. Part number is DCE10038L .Hope all that made sense