Caslau and Rob-T, In regards to keeping your battery on charge, the technically minded will tell you that the on-board charger will not charge the battery to 100% where as a smart charger (CTEK3600) will initially charge the the battery to its maximum (100%) and from thereon will trickle charge when there is any voltage drop, due to natural gassing.
There are three recent threads about charging a leisure Battery under Technical,
best regards, Martin