I'm in the UK aswell. Was able to play friday morning, but that city didn't save. Tried again today, worked for a while then kicked me off, saved luckerly. Went back on, worked, city was there but a few minutes after playing there was some sort of 'processing error' with my city, and it asked me to restore it to a earlier date (the city) or abandon it.
For around 4-5 hours or so now, I've not been able to log on - On any server. :(
Good on Maxis for actually posting what they're doing to fix this.
Idea: stop buying games that require always-on Internet connections--not only do they almost always have issues, but you're only encouraging *more* of this.