Information on O2 Traffic Line is available on O2's website
here. It says it's operated by Trafficmaster.
I've joined your post to the thread for Trafficmaster.
RAC Traffic Information is 01234 757074 and from there I found Norwich Union's traffic information number is the same ending 012.
As it's Trafficmaster that provides the information then it's likely that it will be a similar 01234 7570xx number. Having said that, as they're all provided by Trafficmaster, then it's going to be exactly the same information through all services.
And having said that, you might like to use one of the 01234 alternatives I've just given.
Go to the database search page and enter
trafficmaster and it will come back with all relevant entries.