Re; COLOR - the green card used to be blue before it was pink! (I've been here a long time). My understanding of the UK / US citizenship is that the US does not allow you to hold any other citizenship at all so officially you would have to renounce your other citizenship. This is what has kept me as a British citizen all these years -- I can't say the 'I renounce' word.....

The Brits don't care -- you can have 10 citizenships for all they care. I retain mine partly because I have a house there and one day will live there half the year -- partly because I came in British and I'm going out British. Regarding the medical care Barry -- I know this is hard to take in - but in the UK if you are sick -- THEY TAKE CARE OF YOU REGARDLESS OF CITIZENSHIP.....!!! (Deep breath - don't over react!)...I know it is a strange concept and you will need to wrestle with it but there it is.....