it’s February in Melbourne Australia and I have a peach tree full of peaches which themselves are full of these worms (pictured below), I’ve lasted them out on a leaf for contrast purposes but they were found within the peach. Does anyone know what they are?
That is a "maggot" infestation. It is the larva of a fly. The exact species of fly is not known. I am attaching a couple of links that describe "Queensland fruit fly", an Australian species which may be the culprit. If it is not (Queensland is quite distant from you), you should check for further information more locally to you.