The Nokia Lumia 920
has been released for almost all mobile carriers in the UK. There is only one carrier that hasn't gotten the newest Windows Phone flagship device, and it looks like that may be changing. O2 has been the only carrier that hasn't released the device, but the O2 product page for the Nokia Lumia 920 claims that the device is "coming soon".
O2 has been the second largest wireless provider in the UK over the past couple of years, so not being on the carrier has been a source of trouble for the Lumia. But, O2 has consistently promised that the device would be released by the end of February, so that only gives the company about 9 days to make good on its promise.