An Arizonan's two-cents worth
And about what it's worth!
I think the most important things you'll need for the trip are a good attitude and time. Relax, enjoy the experience, and make sure you take the interesting side roads you see -- just like you would here in the States!
I have been to the UK once -- and I absolutely loved the time I spent roadtripping there (in Scotland). Traffic in the cities was too intimidating for a person used to driving on the right side instead of the left (and traffic moves very fast even when things are congested) -- but the country roads and highways Essexgirl mentions are magnificent and great fun.
I LOVED the roundabouts (yes, we call them that here too) and once I went through a couple, found they are great for keeping traffic moving -- no waiting at signal lights! Wish we'd install more of them in the USA but it seems most folks don't even want to give them a chance here.
I never got lost, and only got confused once. The rest of the time (about 3 or 400 miles of driving) was an absolute delight, from the scenery to the people we met along the way.
http://www.roadtripamerica.com/forum...lighthouse.jpg
If you get up into Aberdeenshire and along the North Sea coast in that area, may I recommend the drive out to Old Rattray (there's an offshore lighthouse there and a great secluded beach),
http://www.roadtripamerica.com/forum...ks-fishbar.jpg
and Eck's Fish and Chips in Fraserburgh -- best fish and chips I've ever had! I also wanted to try Ratty's Tea House at Old Rattray, but it was closed the day I was there. Bob