Owain wrote:

Ah yes (although it's 713-12-01 in my rather old edition) - "its
effectiveness shall be verified by a test simulating an appropriate
fault condition and independent of any test facility oncorporated in the
device".

The preceding bit says "where protection against indirect contact or
supplementary protection against direct contact is to be provided by an
RCD ...". Therefore I think that to verify "its effectiveness" you
certainly do need to do more than just "check it goes click."

BCO is happy to test with his little martindale plug tester and be on
his merry way :-)

Yebbut he's a BCO; *you're* wanting to do the job properly.

Quite. I suppose this is the effect of BC not being allowed to pass on
the cost of proper testing. They're now using a cheapskate DIY approach...

--
Andy