You definitely need a multimeter, but you are not going to test your earth with a regular one. ideally, you should find your rod and verify it's connection to the earth bar. Failing that a small (say 15W) incandescent lamp connected to your isolated rod lead (pull it from the earth bar) and carefully dabbed onto the live, lamp lights, decent earth, certainly good enough to trip and RCD, no light, start looking! Electrically, there's no difference between the N going via the earth bar and N-E being linked in the CU (Aus uses this way). A 2-pole cutout is a useful addition, maybe get a 100A main-switch from the UK like we did? https://www.tlc-direct.co.uk/Products/BGSW100.html There are all sorts of local things that could be used including purpose made isolators in nice boxes, with a nice price.
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