My Robin 1630 does not usually trip most RCDs but sometimes it will tell you D-lok is not available, but try it again 10 seconds later and it is ok.
It always trips MEM2000 RCDs
In my PAT testing experience ............unless they have carefully counted the items (in which case it should be defined better than 30-40) there are nearly always more items than they think.
I would agree, a lot of sparks (perhaps less confident?) opt for code 1 & 2 when code 4 is more appropriate. It can be a bit like crying wolf, how do you differentiate between a live wire sticking out the wall and no rcd protection if they are both code 1?
Maybe work creation or maybe over...