Your question is starting to collect dust. Perhaps you'd do better in one of the Australian Forums.

To do so, go to the list of forums at http://forums.gardenweb.com/forums.

Once there, click Australia forums to see a list of possibilities.

Whatever it is, and if it was here I'd say it was an Elm but I don't even know if you have them there, it is definitely a young tree so not something you want growing in a flowerbed up against the house. You may find it harder to 'pull' than it looks. Have a spade ready.

Thank you I think you have nailed it- i will add a picture of the tree we have in the garden. I actually compared the leaves the other day and they were so similar just different textures I just thought it couldn't possibily be a tree as there are so many I thought it must be a weed. Sadly there is no more room for trees so I best dig them all up and thanks for the tip even the small new growth was hard to pull up so not looking forward to the larger ones!!!