So far I have redone the door membranes (which were leaking, a lot), coated the scuttle panel in flexane, masticked somewhere up inside the dash that I though may be letting water in and replaced any missing grommets in the bulk head. Also spent many a rainy day sat in the car trying to see where it was coming from still and could not determine anything conclusively.
So I bought some windscreen sealant from halfords
http://www.halfords.com/webapp/wcs/stor ... yId_255230
and
http://www.halfords.com/webapp/wcs/stor ... yId_255230
After cleaning under the seal as well as I could with a toothbrush and drying afterwards I used the black sealant where the seal meets the bodywork and the clear stuff where the seal meets the glass.
With the black stuff I was able to lift the seal and place the tip of the tube underneath the seal to squirt it in, but with the glass side I could not and had to settle for applying a fine bead where they meet.
I also used the black stuff the fill in any gaps around the passenger windows where the various bits of seal dont match up and it looks OK, and also used it to seal underneath the spoiler as I think occasionally some water is getting in through there.
If any water still comes in after all that then I am at a loss as to where it can be coming from!!!
I just want to put my carpets and soundproofing back in and have a comfortable (ish) car again.

