symmo wrote:

Anyone come across this, and any idea what the cause could be?

Yes!!! See bold bits especially! Windscreen out job!

K9F wrote:

I have had a period where I have unfortunately had to have two windscreens replaced within a short amount of time. Initially in severe downpours I too had water dripping from under the dashboard on the passenger side footwell. On the initial windscreen removal I was shocked to see exactly how much water and grime was sat in the windscreen channel on the outside of the vehicle. (With seal removed). The company that was fitting the replacement screen said it was a known corrosion hotspot on Defenders and that the windscreen and seal should be sealed to prevent both water ingress and corrosion particularily along the lower edge. No problems since!

fekete wrote:

Just had my window re sealed, looks like it done the job... thanks to K9