Appliances have certainly been smaller over here on the whole. There does seem to be a trend for larger washers and fridges in some homes though, and "American-style" appliances are now much more widely available than just a few years ago.

Quite a lot of places now sell U.K. versions of Whirlpool, Maytag, etc. For example:
http://www.ogormans.co.uk/whirlpoo1.htm
http://www.ogormans.co.uk/american1.htm