Ring continuity test high reading

Ok, it must be that at the socket you tested the L-L terminal was adding some excess resistance, perhaps because the screw was loose. The problem cannot be elsewhere, because the wires when removed from the socket tested fine.

Now the problem is why you asked this question. You should have enough knowledge of circuit theory to know that there cannot be any other explanation, however good you think the socket L connection was. Remember Sherlock Holmes, "Once everything else is eliminated (CU loop test), that which remains must be the answer however unlikely (Poor L-L connection in the socket). (Paraphrased slightly to match the question). If the same problem happens with the Earth, the answer is much more complex, because there may well be parallel paths present, supplementary bonding, or any number of similar things. 

If you're sure the socket is on the ring, and not a spur, following Step 2 and Step 3 of the ring final circuit test may provide you with more information (give or take the resistance of the switches if switched outlets). 

Make the cross-connections at the CU so you have a reference point to work from.

Ignoring measurement error and contact resistances …

For Step 2, the readings should be roughly the same at every point on the ring (increasing above that for spurs). If there's a break somewhere in the neutral at or around the socket-outlet you're seeing the issue from, then you will see readings deviate from the norm, usually increasing to the point of the break, then decreasing again.

For Step 3,

• if the live conductors and cpc have the same CSA, the readings should be roughly the  same at every point on the ring (increasing above that for spurs)
• If the live conductors and cpc have different CSA or are different materials should increase as you move around the ring from the CU. The reading at the CU should be around r1r2/(r1+r2), and the maximum reading on the ring (which occurs at the mid-point) should be around (r1+r2)/4.

Step 3 can help identify faults on protective conductors in the same way - if there's a break, readings will increase to point of fault, and decrease again as you move back towards the CU around the ring.

If the break is in the line conductor, the readings will increase to the point of fault in BOTH Step 2 and Step 3.

Johnny: 
 

I recently tested a kitchen ring main circuit during an EICR. I removed a socket in the kitchen for inspection and tested ring cont. The L-L and N-N was both 0.24 ohms. But when testing the ring continuity of the kitchen skts from the consumer unit the L-L is 0.24ohms and the N-N is 0.57ohms.

I suppose that you are testing the correct ring's neutrals and not another ring due to incorrect terminations?

Z.

Zoomup: 
I suppose that you are testing the correct ring's neutrals and not another ring due to incorrect terminations?

 

Z.

Steps 2 & 3 of the RFC continuity test will also identify that issue.