I used neon tester, also can feel power through bare screws on fridge,
also shows on socket fixing screws with neon tester

Being able to feel a tingle yourself is far more of an indication that there
may be a problem than a useless neon tester.

Do you know what type of earthing system you have?

Do you have an earth rod?

In any case, if you don't have much of a clue yourself, I'd get the
electrician in PDQ. Make sure he knows you have an issue with the earthing
and that he/she should specifically test the local to installation earth
potential.

Christian.