UPDATE:
The guy from Auto Tinting Centre came out to my house this morning at 8:30 to have a look at my car.
After drying the rear window very carefully with wads of kitchen roll he inspected it very closely. He said there was definetly not a single impact mark anywhere on the glass. He checked the contacts where the power wires actually join the window and he said there was no rpoblem there either as SEAT had those parts coated in plastic. He explained that in the past most cars had exposed metal connectors and sometimes they would touch the metalwork of the car and would cause the whole area to heat up. He said the explosion would normally happen when the window was cooling down.
He then started examining the edges of each and every heating strip that runs along the window. At the very bottom left hand corner he noticed that the edge of the strip where it went into the blackened area of the windows border, was discoloured and in his opinion was certainly burnt out.
When I was on the phone to SEAT I had told them that you could see from the pattern of the broken glass where the centre of it started. I described it to them as being similar to the effect of ripples spreading out from a central point when you throw a stone into a still pond. Guess where the little scorched bit of element was? Thats right, bang in the epicentre!
Guess what SEAT are going to say? Not covered under warranty due to tint!
Strangely enough when I phoned my work to tell them I would be in later today due to my rear window having exploded, my boss instantly said without any prompting from me that he had heard of it and that it was caused by the rear heater not switching off and causing an explosion.
Im getting the window fixed by the tinting company for £135 in total and that includes the tint. I've discovered since that when I took out my insurance I had got all of the extras taken off so that i could get cheaper insurance! oops!
I'm just glad to have it sorted out in the end. Im very dissapointed that SEAT could not have sent someone out to check the car and see what they would say. I suppose that Kelly was actually being quite nice to me considering that I was going on and on, but its just that they were not willing to flex the procedures any considering my window would cave in if moved. I accept that they would need to have seen it in the flesh, or metal!
At least my wee car is back on the road and I will be happier knowing that no-one can steal all my stereo equipment easily!
I have attached the same pic that I posted up earlier which is what I believed top be the centre of the explosion judging by the direction and pattern of the broken glass. This was taken BEFORE I saw the tinting man this morning. I have circled the area which he pointed out to me was the scorched element which had actually burned through the black border that was actually in the glass when sold by SEAT. Not the actual tint itself.
What do you make of that? Would never have been able to see that if the window did not have a tint on it. Pretty interesting actually.
Im never turning my rear heater on again. What is it that you're meant to rub on your window to stop misting? Is it a potato or an onion os something? Probably an old wives tale!