A:AnswerIt supports multiple voltages. However, you might need to buy a cheap converter to fit the outlet. It is a simple, passive gadget that adapts US plug into UK outlets. Do not buy a power adapter. Do not buy a voltage converter.
A:AnswerI cannot answer the first part your question, but the camera does not come with a charger. The battery is charged while in the camera. I believe you can buy a separate charger.
A:AnswerIt depends on what you're uploading the footage to. Mine did the same on Final Cut Pro and it was because I recorded in 60 frames per second and I was watching the footage in 24 frames per second... so check the play back and make sure it's in 60 fps