leaky disco

I have a '98 disco 1 and when it rains i get water coming out of the very top left corner of the windscreen from behind the post trim and also out from behind the tiny speaker. I've tried a hose pipe over the screen and over the whole roof but can't make it happen! Any suggestions where it's finding it's way in??? I'll be gratefull if anyone has any ideas because it's beginning to hack me off!!

The roof lining on them are rigid and not made of cloth so water could be making its way in from anywhere above the gutter.
Ie sunroof, if yer got one,
screen rubbers, little windows at the back.
rust holes at the front. Mine had one.
bugger to find though
good luck!

common leaks are from:- sunroof (drain tubes blocked/fell off) windscreen (very common) alpine lights (water runs fowards then drips out by the screen)

Cheers for the suggestions, I've checked sunroof tubes which are ok and already found 2 areas around the windscreen(both top corners) which are leaking and fixed those! Will next have a go at the Alpine lights.
Cheers again.
Sparrowhawk