What the hell is that?

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This was a desperate attempt to fix the leak. I’ve removed it as it didn’t work. I managed to replace the hinge washer, which had a small hole, but that wasn’t the issue either. I’m running out of ideas. It’s been four days in typical English weather trying to track down where the leak is coming from, and I’m close to giving up. Tomorrow will be my last attempt. As much as I love my car, this is driving me crazy. I'm using tiger seal
 
It is not aerial. When I pour water on closed boot hinge area it is coming in pretty quick🤦‍♂️

Ok, have you checked the rubber hoses for the wiring? And also the plastic housing by pressing inwards (towards the front of the car) as cracks may not be visible when opened
 
fold back seats down and take parcel shelf out get in car and get someone to pour water on outside even remove inner seal and check around there even the rear spoiler
I can see only where it is dripping from. I don't know how it enters my car. I will try to get endoscope camera maybe this will help.
 
Not much done as yet, got MoT coming up soon so want to get things ready for that.

But... something did turn up for it so....

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