Jeebo, your diagnosis is spot on. The water is definitely entering around both rear light clusters. Obviously new seals required. I thought I would have a go at it myself-------am I being wise. I presume that it's just a case of removing each light cluster, removing the old seals and inserting the new ones. Would value your opinion on this.
Jeebo, thanks for your help. As soon as it gets a bit warmer I shall get the hose out and check all seals etc. The fact that I have completely emptied the boot ( some job ) helps a lot as I can actually see the possible sites of leakages now.
have checked around the top of the hatch and can't see any water marks. Completely emptied the boot and used the rear screen wash ----still no sign of water ingress. I suspect it is coming in through the bodywork from the outside. Think I will just have to be detective for a bit.
Having completely stripped the boot and removed the spare wheel I found that the spare wheel basin had 2 inches of water in it ! I suspect that it has gradually built up, perhaps over years. Eventually it has reached such a level that, during normal driving and braking, the water has slopped forwards and seeped into the rear seat area via the back edge of the seat where it meets the vertical seat back. The rear part of the felt boot lining was dry, only the front third near the rear seat was wet.
Now that the boot is completely empty and dry I will keep a close check on it, paticularly during wet weather, to try and find the point of entry.
What do you think. Also thanks for your reply and suggestions.
P.S. In the floor of the spare wheel basin are 3 grommits. Would it be sensible to remove one to let any water that enters to pass through. Not the proper answer I know.