Apparently down, any news on this? Trying to get in touch with my old man who's on a business trip to London just to make sure he's ok.

Would appreciate any updates as you hear them!!

the o2 site hasnt had an update since half 9 :-/

"Our engineers are continuing their work to fully restore service to customers with network issues as a priority."

Last twitter update from 02

Service update from O2:
01:00 We can confirm that the problem with our mobile service is due to a fault with one of our network systems, which has meant some mobile phone numbers are not registering correctly on our network. As a result, some customers are having difficulty making or receiving calls, sending texts or using data. We, and our central supplier, have deployed all possible resources and are working through the night to restore service as soon as possible. We apologise again to customers affected and will provide further updates as soon as we can.

taken from 02 WEBSITE