What they all said re 240v

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The rest depends on how everything has been wired up.
It would be normal for the leisure battery to charge via a split charge relay, so this should charge as you drive. The zig (CF8) has a basic built in split charge function which assuming the unit is wired according to the manufacturers instructions will connect the two batteries as long as you have the switch on the unit set to 'Touring' - the only trouble, if you forget to switch back when on site, you drain both batteries, so I would always use a relay as well.