O
Octopus
No spin this was an individual circuit.
Then you have an easier job to do then .........
How many socket circuits in the property?
I was doing a CU change recently and when I tested the "immersion" circuit I got a similarly low reading .................. I found an RCD spur that a plumber had added for a shower pump ................ removed the RCD spur and the readings went over 30 mohms