Peugeot 107 leak in boot and to rear passenger seatbelt

Hello all,

I'm looking for a bit of advice about my Peugout 107. As expected it is leaking and has water in the boot that seems to be coming from relatively high up - the 'shelf' section on the offside is wet and there is a puddle where the spare is. Interestingly it is also wet on the ledge between the rear-offside passenger seatbelt mount and the boot. I've researched it and done the following:

- removed and cleaned the boot seal - resealed it with sealant and moved it round a good few inches.
- removed rear light clusters and applied sealant
- removed bumper and applied sealant to rear vents
- sealed top brake light

From memory the top brake light and vents were wet around them before I resealed them and the boot rubber was very grotty in places.

I thought this would solve the problem but there is still water in those places.

I have since sat in the back whilst someone pours water along the boot, light clusters and rear windows (it is a 3 door). There is no evidence of water coming in. I also can't trace the water any higher - I've taken off the side liner and there's no sign of water there.

Has anyone got ANY ideas??? I really can't see where the problem is and it's driving me mad... just sealing those four points took me all day.

Any help much appreciated!

Sara