Answer: When I have responded to others looking for UK assignments, I am usually doing the exact same thing as they are: typing “international travel nursing” into some search engine. Without firsthand knowledge, it is often hard for me to write extensively on a subject. However, I do know where to find a few resources.
Nursing forums are always the places for very specific questions on travel nursing. Join as many as you can and post or search for questions pertaining to international travel. Delphi Forums has a few forums that are dedicated to travel nursing as well as Ultimatenurse.com.
One UK site where I might start is Continental Travel Nurse.com. They have a lot of info on their site and speak to what is required to become licensed to work in the UK. They also have links to the English proficiency test that you must take to become licensed in the UK.
This should give you a place or two to start and I hope this helps.