Just thought I would update the story....
After trying everything else I had the radiator changed by a local mobile mechanic this cost about £190.00 in total using a pattern part - the radiator was really full of rusty muck. Now the temperature is back to normal (90 degrees and the car runs just like it did before all the problems.
However, this did not cure the issue with the windows steaming up which has now got even worse. Everything is fine if I have the heater controls off or the climate control on cold, but as soon as you turn the temperature setting up and the blower on a mist comes out the vents, the inside of the car smells and the windows look like they have been cleaned with a dirty cloth.
This all points to a faulty heater core/matrix but the strange thing is I can not find a leak and I do not seem to be losing fluid.
Be warned if this happens to you, the main dealer has quoted me £117.98 for the heater core/matrix, clamps and fluid and £805.00 labour (7 hours @ £115.00) both plus VAT/TAX @ 17.5%. But they did offer me something called a 3+ discount of 10% so the total cost reduced to £976.00.
I think this may be the end for my treasured Audi A4!
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