My Cali Beach (2015 Spanish) has a RCB into the compartiment where is the jack and so on, in the left side of the trunck. Never used (my Cali is 2 month old) but it is there.
Also have, for sure, a charger which only works when the hookup is connected, and which only charge the leisure battery, but not the main one (I'm 100% sure about that).
If, when connected the hookup, you get current in the 240 outlet, but there is not more than 13v in any 12v outlet but the lighter one, your charger is not working. I would have a look to the fuses.