Water water everywhere!

Can anyone explain this? Maybe inform me how to stop it! That would be great it's the first time I've seen it but it's rained today and on the front passenger side pillar it's all wet, dripping wet infact! :/ and before you ask I don't have a sunroof so it's not that!

I expect it's the gutter seal, have a goop look on both front corners of the gutters. They need sealing AGAIN. Also check the windscreen rubber in the top corners but I suspect it's the guttering.

You really need to un clip the head lining along that side and look or feel for the direction the water is coming from, its not necessarily from just above but could be from backwards towards the rear, the seal along the gutter is a known failure point and allows the ingress of water according to the Forums.
If so the use of Captain Tolley's Capt. Tolley's Creeping Crack Cure is the stuff to use I believe.

Top of the windscreen.

Gutters

Roof bars

Alpine Windows.

Take your pick where to start looking.