Well actually the 'phone' is working fine, I have full signaal, full battery, etc. I just can not receive or send anything or make any calls. I've spoken to o2 and they said they are currently dealing with six faults which have blacked out various areas in the UK - of which North London is NOT one of them. If it's not back up and running again later (which is actually in a few minutes as I phoned them this morning with the problem) I have to call them again.
So, if anyone has tried to text or phone me today, my apologies but I can't call you back as I haven't received your calls/texts yet! I know my lunch meeting probably fell foul of this as I sat in the pub waiting for 30 minutes for Gideon to turn up and then gave up, got a sandwich, and returned to work.
Fingers crossed it gets sorted later this afternoon.
Service is back to normal :)