OTA in the UK my a**e... Nothing for me on O2 as of now... Same as 1.1.1 - Bad form O2, real bad
What firmware version are you on it maybe your on the global or if your could you somehow have the voda one,
I know a lot of people got their N900's from voda because they were the first to have them. Afaik o2 dont have their own fw so you need to find out which one you have.
If you dont see it tomorrow then chances are that you have the voda fw, if thats the case your best off flashing to the global pr1.2 using the flasher 3.5 tool.