Windscreen seal can look good, if not deceptively perfect, but the metal horrific beneath. The irony perhaps is that one that has extensive rot hidden under that seal will if anything, only show minor bubbling of paint on the seam just below the seal where the front panel joins the two A pillars. The result is that its easy to dismiss it entirely because it looks fine on the surface and you end up sidetracked looking behind front grill, aerial and all sorts. Water can get in other places but 90% of the time its the windscreen lip and its getting in right at the top of the screen, working its way down underneath the rubber and just sitting there at the bottom until time takes its toll. None of this you can see.
If its never had any work done on the lip beneath seal, then chances are its slowly rotting out - most are by now. Longer its left, the more expensive it gets. Tell-tale sign is leaks on floor (under or over mat) and often after rain (vehicle doesn't even need to be moving) when you just pull off.
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Every T25 I've seen has this issue - except those that have had the work done. Many assume the seal itself against the glass is letting in water as it puddles there, but in a way thats a smaller version of whats going on under the seal in exactly the same place and entirely hidden from view. Read above article and start examining that area in much more detail. Also forget any ideas about silicon sealant - it won't work. The sooner its fixed, the easier it is to do it generally. Middle and rear side windows too can suffer this fate and anyone who has done those will vouch for how much worse it can be once window has been removed.
