Today's update, i found a melted wire in the spare tyre well. It was the wiring for the reverse camera I had installed a while ago. It gets signal feed from the reverse light. but needs + power also and an earth. The + wire and earth wires which are twin cables , melted together. The + should only have power when ignition is one, but it seems live as it sparked when I touched it. So i believe this could be my drain source?
Pos to earth. I have cut the offending wire and isolated them. This might explain why I got the error on the dash to check my reverse lights last week, but after checking they were functioning.
I haven't disconnected the NEG battery and run an amp meter on it yet for drain readings.

