No they are not. UK Wiis run PAL games only. US Wiis run NTSC games only. Although you can make your Wii region free, which will let it play games from all over the world. You will need to softmod or chipmod your wii to do this. Softmodding is easy to do though (you can check this easy guide out for more info: www.howtomodyourwii.com)
the wii kind
Xbox games will not work on a Wii, and Wii games will not work on a Xbox. however, if you mod soft your wii, you can play games from old platforms.
yes
yes they do cause i got a wii in china.And i live in Australia
Yes, because both the UK and Australia use PAL.
No. You need to buy UK games.
probably not unless you mod your Wii
Just the first Nintendo Wii.
No they don't. Regions work on their own regions. Games bought in certain countries or regions will be restricted to only consoles bought in that region.
No. US games are NTSC while Australian consoles only play PAL games. I think that Australian consoles should work with European, Indian, Chinese and Brazilian games but not American, Canadian or Japanese.
No
Only the Nintendo Wii can play Gamecube games. None of the Wii U models are capable of playing Gamecube games.