how do i fix a glazed block im just interested?
do i need to rebore or is it just polised down?

You would need to replace the rings and all that entails. A re-ring job rarely needs a rebore unless the cylinders are damaged.

Unfamilia is an expert at sorting out bad rings. He is located in Melbourne.

The correct way to do it is to measure the bores (usually top and bottom and at 90 degrees, so 4 measurements). If the bores are within spec you can use a de-glazing hone on a hand drill to put the cross hatch pattern back into the bore. (there's more to it than that but that's a good start)

Once the bores are prepared, new rings and often new bearings plus all the gaskets required to put it all back together. If it needs a re-bore then add new pistons as well.