Driving me nuts.

After it rains I get a puddle on the boot liner carpet.

First thought this was either hatch hinges or maybe roof ariel leaking but after sealing those still there.

I took boot liner out and spare wheel and this morning there were a few little puddles around the drain plug rubbers?

I have now lined floor with some tissue to see if i can get a better idea of where the leak is.

I am now suspecting the rear wiper window grommet as that is kind of the area the water is dropping soaking the floor at.

hopefully sort it this weekend, as getting fed up with not able to use boot.

If anyone got any ideas or ways i can root cause this would be gratefull

back lights, common on most cars, check these as the water runs down the gutters then round back lights