There are some places there that have 110V 50hz.
Unfortunately, unlike a number of their other tools, the North America ETS 125 EQ is a 60Hz machine only. That means that even if you were to use a U.S. ETS 125 120v 60Hz sander on an adapter in the UK, it would run slower and more importantly....hotter. Not a good option.
Best option is a 110V plug-it made for the UK tools...
Going the opposite way...ie 50Hz only machine running on a 60Hz service wouldn't be problem generally. Would run a bit faster, but cooler. Unfortunately, the OP has got a pretty hard dilemma to deal with. Good luck with a solution.
Cheers,
Frank