HI this question was restructured from a different question. 

I am looking for a few websites, or even an official government
website, detailing laws/ordinaces about the following things in the
United Kingdom:

Bringing prescription medication into the country, and getting refills. 

How long a citizen of the United States can stay in the country,
before requiring a work permit or Visa.

What is the law on bringing a cat from the US into the UK? Is passport
for pets active for US citizens and their pets?

What is the ruling on credit profiles within the UK? Do you have to be
a citizen to have, something like a Social Security Number? Or are you
assigned one when you visit/move?

Dear tbonecopper-ga,

The legislation covering these matters are very voluminous, and is not
only UK laws but is also EU legislation. The following web sites
should provide the guidance which you are seeking.


Prescriptions and medical matters
==========

Brief introduction on bringing medicines into the UK by the British
Embassy in Washington DC
http://www.britainusa.com/sections/articles_show_nt1.asp?i=41123&L1=41118&L2=41123&a=28529&D=3

UK Government?s Department of Health and Social Security guide to
overseas visitors on obtaining health care in the UK - detailed
information. Emergency care is free, but other treatment and
prescriptions depend on whether you are classed as a resident of the
UK or a visitor.
http://www.dh.gov.uk/PolicyAndGuidance/International/OverseasVisitors/OverseasVisitorsBrowsableDocument/fs/en?CONTENT_ID=4099060&MULTIPAGE_ID=4954581&chk=h9MVFS


Visa
====
UK Government web site - UK Visas and whether you require a visa
http://www.ukvisas.gov.uk/servlet/Front?pagename=OpenMarket/Xcelerate/ShowPage&c=Page&cid=1006977149953

British Embassy in Washington DC - Visa information
http://www.britainusa.com/visas/visas.asp


Working
======
Government site - Working in the UK (seems be temporarily unavailable
when I tried to access it, but I know from personal knowledge that
this I site to look at.)
http://www.workingintheuk.gov.uk/

British Embassy in Washington DC  - Working in the UK
http://www.britainusa.com/sections/index_nt1.asp?i=41124&L1=41000&L2=41124&d=0


Pets
===

Government site - Department for Environment, Food and Rural Affairs.
Pet travel information
http://www.defra.gov.uk/animalh/quarantine/index.htm

British Embassy in Washington DC - Pet Travel information
http://www.britainusa.com/sections/index_nt1.asp?i=41095&L1=41000&L2=41095&D=0


Credit Agencies
============

Depending on the circumstance surrounding residence and employment you
may be issued with a National Insurance Number. This Government site
provides some information on the system. The site is also has useful
information on tax matters.
HM Customs and Excise - National Insurance Number
http://www.hmrc.gov.uk/nic/ynino.htm
Home page
http://www.hmrc.gov.uk/individuals/

There are four main credit references in the UK. The Government?s
Financial Services Authority has information on how credit reference
agents operate in the UK. There is also additional consumer
information and guidance on financial matters in the UK.
http://www.fsa.gov.uk/consumer/04_CREDIT_DEBT/mn_lender_info.html
http://www.fsa.gov.uk/consumer/04_CREDIT_DEBT/mn_file_info.html

You will not encounter the involvement of a credit reference agency
until you apply for credit. Giving previous US addresses will allow
the agencies to check back to the US and also create  a new UK record.
Experien is one such agency and their consumer page provides some
guidance. You will see a reference to US records.
http://www.uk.experian.com/consumer/index.html


I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
answerfinder

Search strategy
Personal knowledge as a UK resident

I should make a patchwork qulit and send it to you to show my thanks.
You have saved me so much time in finding all of these resources. The
only and I mean only 2 I could find were monster.co.uk and
directgov.co.uk.

THANK YOU SO MUCH

Dear tbonecopper-ga,
Thank you for your tip. Pleased I could help.
answerfinder-ga