Tested and working
Controller does have a few marks on the back as shown.
This machine is region locked, you can only play NTSC-J games on this. You can buy a freeloader to bypass this.
IMPORTANT - Do not buy a standard adapter and use the Japanese power supply in the UK as this may ruin the power supply and fry the gamecube.
I have included a 3rd party power supply to be able to safely use in the UK, in addition to the Japanese one.
Any questions, please ask!