Did some research on the web and found the answer.
It was a good job I did. I contacted my local Audi agent and asked for advise. As usual the response was "We would need to have a look at it first"
An inspection quote was given.
So it was going to cost me whatever the problem (big or small)
After going through the owners manual for help........I typed in "Audi A4 soft top problems" into good old Google and up came a multitude of answers.
Of course there will always be different reasons (faults) for soft top problems, but I got the answer to my own particular fault from a nice chap who lived in the States who just happened to post his own error on Youtube
I followed his short film and hey presto......problem over.
Now I am not saying my Audi agent was unhelpful. But I am sure they too would have some information as to what certain (easy) problems with soft tops could be. It seems they are more interested in making a fast buck than being of help to customers who have bought their product.
Sorry.......just having a moan