OP
pipunch
Ok thanks - i actually found a video in French which shows the bottom L and N poles on the RCB wired up to the L and N poles on the first circuit breaker as i suspected.Looks to me like the two connection block L and N are just that, the thing you describe as a copper thingy with pins, is Bus bar to feed the top of the DP CBs the L and N at the bottom are for the out going circuits.
Still don't get what that picture in the middle on the left is all about, with the L and N poles wired to the N and L on the first CB.
Any ideas?