you can't
UK is 220v
Yes, no problem.
nothing
Voltage is not an absolute figure. Voltage Difference is the exact term. So, the voltage difference between the two wires in the 220 V circuit will be 220V.
Yes, using a 220v-60hz microwave in Australia is fine. The voltage of alternating current supplied to homes in Australia is 220v. The frequency of the voltage is 50hz.
Yes
Yes no problem the transformer should run a little cooler as well.
220V : 12V 55 : 3
No, a device designed for 110v will not work on 220v without a voltage converter.
To convert a 4-wire 220V connection to a 3-wire 220V connection, you will need to remove the neutral wire and connect the ground wire to the neutral terminal. This diagram shows the proper wiring configuration for this conversion.
More than likely yes it will work just fine.