**EXCELLENT source of info** please read!

[color=ff33ff]this is really worth checking out!!![/color]

http://www.ljnelson.com/personal/musings/ustouk.htm

here is some of the info they provide:

Topics:
1.  Staying in the UK: Legal Requirements
 1.1  UK Work Eligibility
 1.2  Work Permits
 1.3  Settlement Visa Process (Spouses and Fiancé(e)s)
   1.3.1  Fiancé(e) Visa
   1.3.2  Get Married
   1.3.3  Spouse Visa
 1.4  Leave to Remain
 1.5  A Word About Citizenship
 1.6  Links Related to Visas, Leave to Remain, and Citizenship
 
2.  Preparing
 2.1  Bank Accounts
   2.1.1  In the UK
   2.1.2  In the US
 2.2  Retain Tax Accountants
 2.3  Cars and Car Insurance
 2.4  Medical Insurance
 2.5  Mail Forwarding and Change-Of-Address
 2.6  Get Your CV (Resumé) in Order
 2.7  Useful Things to Stock Up On & Do
 2.8  Homesickness
 2.9  Stress
 2.10 Move to Another State??
 
3.  Moving Your Stuff
 3.1  The Process - How Your Stuff Gets from Point A to Point B (Hopefully Without Unexpectedly Visiting Points Z, N, and W Along the Way)
 3.2  How Much Professional Involvement?
 3.3  Selecting A Moving Company
 3.4  What You Do Before Moving Day
   3.4.1  How Do I Organize This Nightmare?
   3.4.2  What Should I Bring?
   3.4.3  Forms?! What Forms?
 3.5  What Happens On Moving Day
 3.6  ...And Then You Wait
 3.7  What Happens When Your Stuff Arrives
 3.8  What Will It Cost?
 3.9  My Move Timeline
 3.10  Links Related to Move Planning
 
4.  After Arrival in the UK
 4.1  US Taxes
   4.1.1  Federal Taxes
   4.1.2  Have You Noticed That I Haven't Even Mentioned State Taxes Yet?
 4.2  UK Taxes
   4.2.1  Filing Taxes
   4.2.2  They Pay 60% Taxes in the UK, Right?
 4.3  National Insurance Number
   4.3.1  The Number
   4.3.2  The Contributions
 4.4  NHS Number
 4.5  Retirement Planning Issues
 4.6  Driving License
   4.6.1  Apply for a Provisional Licence
   4.6.2  Get Insured
   4.6.3  Take Driving Lessons?
   4.6.4  Schedule and Take the Theory Test
   4.6.5  Schedule and Take the Practical Test
   4.6.6  Send for your Full Licence
   4.6.7  Links Related to Licences and Driving
 4.7  Absentee Voting
 4.8  Register at the US Embassy
 
5.  More Useful Links

One little warning though - this site was last updated in 2001 - which means that a lot of the legal aspects are incorrect.

For example - the Fiance' Visa is NOT single-entry, it is multiple entry.  Also, the Spouse Visa and the Further Leave to Remain are now for 2 years, not 1.

And now there are only 3 Consulates you can apply to in the US for Visas - Washington no longer processes Visa applications, so it's just Chicago, L.A. and N.Y.

I did come across this site myself when I was making my plans back in early/mid 2002.  It is a wealth of information, if only for the links.

For the life-style stuff, definitely a must-visit.  But for the legal stuff, I would stick with the Home Office and US Embassy sites.

good call!