Thanks Steve.
It's not really an intermittent fault, its most of the time, just sometimes worse than others.
Regardless of that it's still difficult to trace on an SL. If you open the boot, lock/unlock a door or open one the car wakes up for at least 30 mins and never fully goes to sleep so ambient current drain is always high, just not this high. The fault is nothing to do with the Conversion to a Furrari, it was like this as a Merc.