Possible, but the outlet will have a different plug. Most window air conditioners use that type of outlet, and some garages will have it for hobby equipment. I don't think you can legally install a UK (or EU) outlet in the US even though everything that plugs into it would be just fine on our 240V power (a few clocks won't work right, but they won't be harmed or harm anything)
Presumably, you would chop off the plug on the UK/EU kettle, and replace it with your own NEMA 6-20 plug. No need to install a UK/EU plug in your house. Also works good in case you need to use some sort of weird industrial equipment that needs 240V.
Does anyone make a.travel adapter that plugs into a us 240volt socket? Such a thing is easy to imagine, but most houses don't even have an outlet you could plug it into, so the demand would be small.
I would not use a travel adapter for a kettle. They pull major current, and the quality of the travel adapters is generally not intended for that much current draw...
