There are any number of servicemen/companies that will convert American 120v/60hz appliances like washers and dryers to work on GB or EU currents. There are also American export dealers who sell domestic washers,dryers, etc to be shipped abroad already converted. In both instances many of these are appliances being taken by Amercians either transferred or moving abroad (military, businessmen and their familes, diplomatic core, etc).
There is also a large market in Israel, and parts of the UK for large American top loaders and dryers. Many of these are for households with large families/large amounts of laundry where small front loaders simply won't do.
L.