Hi, I have a rental property built in 1985 and obviously wired to the
the then IEEE wiring regs in force in 1985.

I now need to get an EICR and am thinking of things that may fail the EICR.

The current CU is a split load job with MCBs, an RCD on one side and a
simple on-off switch on the other side. is this a pass or fail?

The previous owners ran SWA from a downstairs ring main via a 13A Fused
connection switched spur in the lounge. is this a fail or pass?

In the garage, there is a garage style sub-CU with a simple on-off
switch. Then there are what at first glance looks like conventional
MCB's but rather than a trip/reset switch, it has a trap door that opens
and there is a ceramic cartridge fuse inside it.

see https://i.ebayimg.com/images/g/rP8AA...Tkm/s-l300.jpg for an
example

and the fuses it uses are these:

https://i.ebayimg.com/images/i/25136...-1/s-l1000.jpg

One is 6A for the internal and external lights and one 32A for the
internal ring main in garage.

Will this garage sub-CU require replacement to an RCD & MCB jobby?

Finally, what are the most common issues found for houses built in 1985
that would now fail an EICR excepting really obvious stuff like visibly
broken sockets, visibly broken light fittings, visibly broken wall
switches etc?

Regards,

Stephen.