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The only thing you need is the plug adapters to fit the plugs in those countries. The bricks can handle the voltage difference.
This is correct. You don't need the voltage converter. Leave it at home.
My daughter spent last spring semester in London and travelled to several European countries with her iPhone and iPad.
From the Apple web site --
"The AC plugs included in the World Travel Adapter Kit directly support outlets in North America, Japan, China, United Kingdom, Continental Europe, Korea, Australia, and Hong Kong.
Please note. To use this kit with devices that use a Lightning connector — such as iPhone 5, iPad mini, and iPad with Retina display — you will need a Lightning to USB Cable, sold separately."