Hi Colly!
Like the rest of the responses - don't bother bringing over your US dishwasher, fridge and kitchen appliances - it's not worth it. To buy a voltage transformer that's capable of running high amperages is going to cost you more than a new fridge from here, then you're going to need it installed and checked for safety standards - then rewiring in your house just for this I'd estimate would cost you at the very least £2000+!!. Then you're going to pay alot for shipping the items over - they're heavvvy = alot of £/$ !!!
Sell off your USA white goods there and collect the dosh. When you get here, you'll find USA size fridge freezers now for around the £500 mark (and more expensive models of course!) and dishwashers for around £250+. Kettles, toasters, microwaves etc are all easily affordable nowadays.
On the subject of cars - Well I imported myself over a 2003 Ford F150 Harley Davidson edition about 16 months ago - It's a 'relatively' straightforward process but is subject to alot of red tape (SVA testing, Import duty of 10% of cars value, VAT, shipping costs, conversion to UK road legal status etc). USA cars do sell here but put quite simply - it's only the 'interesting' US cars that generally make it over. If you have something like that - then by all means look into bringing across - I can give you contact details of a good friend of mine who is a USA Car importer by trade and he can guide you through the complete process - just email me if you want! If you have an 'ordinary' USA car - my advice is don't bother bringing it over. Like some of the responses, you're going to find it more hassle for maintenence and servicing time as parts may be an issue, I wouldnt' say 'problem' becuase theres quite a few USA parts importers around. I don't know how to post pics on this forum as yet else I'd post one of my F150 Harley!
Hope this helps a bit!
Dennis! West London UK!!