Please help my head is fried from open earths

[dlt27]

Thanks in advance.
Carried out test on a socket circuit today and found open circuit on cpc’s and lives. Sorted out lives, but earths are driving me crazy. I’ve done all the obvious like connected one earth and then testing sockets etc etc.
In the end after disconnecting everything from earth bar( including main earth, all bonds and all cpc’s ) I was still getting a loop reading at all sockets. Max Zs reading taken was 1.26 ohms).
I can’t for the life of me find out where the sockets are getting a near perfect earth from.
Any info or ideas would be greatly appreciated.

 

[westward10]

Leave one of the cpcs connected to the earth bar and retest ring continuity to the disconnected one, if you have continuity you have a parallel path. I assume IR tests are clear.

 

[dlt27]

It tests are clear.. Thanks

 

[Highresdis]

Connect one cpc to its live at the board, test for continuity at each socket. Check in the last socket that gives continuity (if unclear how it is wired, check those that have highest continuity reading). If necessary, repeat with the other leg at the board. If no loose connections, it may be faulty between the 2 sockets identified.
Don't worry about the mysteriously good Zs with no cpc connected. It's not as important as the non-continuous cpc.