Small CNC Machines

I have a small manual machine at the moment, and was wondering, if
anyone could suggest the best way of going into the CNC work. I want
a small machine, that will mill Aluminium, Plastics And mild steel if
possable. I looked at the taig small machine, would it be robust
enough? Or is buying a small miller and retro fitting best? What can
people suggest?

Thanks
Anthony

Ps. Does anyone know if you can buy the Taig milling machine in the
UK? If so where?