Here's a pic of a friend's consumer unit:
There is no Earth connection to the cable. The green wire (at the top of the pic) is an earth wire going from the earth bar in the Consumer Unit to a rod outside.
This makes the installation TT, probably because other houses in the street have overhead connections.
Now, there was a thread a while back where I'm reasonably sure somebody was talking about getting a TT supply converted to TN-C-S (PME).
What do you think the chances are of getting the DNO to convert this TT arrangement to TN-C-S and, at the end of the day, is there any real advantage?
Or did I misunderstand and somebody was saying that the DNO was pro-actively converting TT supplies to PME and if only happens to you if they're doing down your street.
Cheers, DaveyOz