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Thanks Binky. I’ll give it all another test and prove the meter as well first

Testing using the lead and the plug on every circuit.  I take it my mcbs have the same max Zs regardless of tncs or tns? 

No. Think they’re ok as they’re fairly new

R1+R2 for these were 0.12 all circuits are fine otherwise 

Hi all Is there different amounts and table for a Tns system to a tncs reguarding the mcbs maximum Zs.  I have a Ze reading of 0.40 which is fine but all my circuits have a high Zs reading.  Eg. Two cooker circuits both 40A type B mcbs are getting a reading of 1.22