After all, why should my child be interested in her education if I can't even go and introduce myself to her teacher?? What message does that send about how much I value the importance of her time spent at school? How otherwise does she know I care about what she is doing with the bulk of her time?

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I don't think that you can base a parents level of caring about their child's education on how often they check in with the school.

As far as my child is concerned, he knows that mum and dad go to work, and his job is to go to kindy, listen, be respectful and try his hardest.

He is well aware of how much we value his learning based on many of the play/reading/drawing activities we do together and the pride we show in any of the artworks he brings home.

However, I am very careful to try as much as possible, to leave his relationships with his peers and teachers, between him and them.
His time at school (anytime away from us for that matter) is time out from us for him and his own chance to explore his world, it's boundarys and it's expectations.
If I was to turn up at school on weekly/monthly basis for no reason other that to "check" on him, what message am I sending him? That he had better to well, because I am watching?

No.

I expect to be made aware af any major hiccups, but I also expect that his teachers are capable enough to sort and rectify out any minor issues ie being silly for one day or not doing a set task without resorting to having to "dob" him in to me.

I think that, in some circumstances,too much parental involvement in school is a little like sharing a house with your boss.
And who wants to do that?