Hi Roger
Many thanks for your comments, I have managed to get a local direct replacement for the battery that was in the vehicle.
I can confirm all works OK....so many thanks to you and Lee.
However, when I changed the battery it is clear that this may have been changed at some point in its life.
I am sure the same as other Alphards there is a built in shelf with screw holes for holding the battery, that can clearly hold a larger battery size.
At some point it has had a tray fitted on top that holds the smaller size battery.
Obviously the smaller size works but I suspect it maybe not as robust as the larger battery.
Next job replace the leisure battery with a lithium one....and find a local key replacement!
But for now at least I can get out and enjoy... :)))