What do I need for a Sony car stereo in a ford KA 2004?

Ok so I'm currently in Australia and I'm looking at buying a Sony stereo to take back to England with me for my Ford KA. I know that I already need to buy a new fascia, wire harness and aerial adapters but some people are saying I need another wire harness specially for Sony. Is this true if so will it come with the harness or do I need to buy it separately?

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