[Josieb1]

The only way to be able to transfer from .co.uk to .com is to have acces to a US address. You load the US address as an address on your UK Amazon account, then you go to your Manage Your Kindle page in the UK, go down to the Country, select Edit and choose the US address you loaded onto your account. Then follow the prompts to transfer your Kindle account to the US. Make sure you have loaded an i click payment method to the US address before you go to Manage Your Kindle, a UK credit card is fine. Both the UK and US addresses stay loaded on your account so when you want to come back to the UK you just do the same process from the US Manage Your Kindle page, selecting a UK address. I have transferred back and forth loads of times, even as late as this week.

You don't lose any books, from either site, when you transfer, and pre orders still arrive on the due date even if you are in the other site on that date. I have never been charged any fees either and I download over wifi or 3G

Maybe I am just lucky, but I will continue to do it until Amazon stop me