its right in the rear cornerleaking rear 1\4 windows,back light's?when the boot's up have a look under where the hinges are any drip's i just found a bit of rust on mine,and evidence of water ingress.
same as mine mate pop the rear light's out silicone them and refit,take out the carpet and get a hair dryer on it,or stick it in an airing cupboard if you have one,god im showing my ageits right in the rear corner
where the light is but i cannot seem to find any incline of a leak there just a wet patch in that corner
lol ill give that a shot but im pretty sure its not my lightsame as mine mate pop the rear light's out silicone them and refit,take out the carpet and get a hair dryer on it,or stick it in an airing cupboard if you have one,god im showing my age
mines a saloon i dont have the wiper mountI had the same prob, did the light and no cure. Got some more advice and in the end i black siliconed umbilical lead, the areial mount, wiper grommet and both lamps. Im now damp free and have been for a while.
Thats one you can cross of your list thenmines a saloon i dont have the wiper mount