Soaking wet boot floor

[Rob2016]

I have a 63 plate Ford Fiesta 7.5 Titanium and noticed the car was starting to really smell. I originally thought it was the air conditioning was gave that a clean to no avail. After investigating i found that the boot carpet was soaked and the spare wheel recess full of water. Ive searched through many threads and pages on Google but can not find a clear answer as to were the water is coming from in order to fix.

Any help would be much appreciated.

[Jethro_Tull]

Around the rear lights is a favourite.

[HenryV]

Rear screenwash jet supply pipe split?

They can split around the gap between the roof and the tailgate if they're being bent/kinked every time the tailgate is opened.

[lukew1985]

I've seen this on here before . if I remember correctly it Was either lights or the boot seal itself