Just have car in tow mode and precious owner pull the ESS service disconnect.
So, it will stay in tow mode even after the ESS service disconnect is pulled? Should they also disconnect the 12V battery so it doesn't drain? (will it drain?)
The seller says the car charges to 185 in standard charge mode, which is pretty incredible considering its age, if that is true I'll be very excited, but if its mid 170's that is still pretty good so I'm hoping for the best but preparing for the worst. It is probably worth having him give it one last full charge before dropping it off at the port in South Hampton though, hopefully they have a HPWC down there for him to top it off.
Does everyone recommend putting into range mode for the final charge? I'm thinking better not to leave it at 100% for those first few days (before it self-discharges down), for the health of the Lithiums, they are better off never touching the 100% mark for very long. I'll ask the seller to charge to 100% range-mode and then drive to the port to burn off the first 15% or so (based on his location/distance from port), then put into tow mode and pull the ESS disconnect.
At some point he did have the car brought over to the UK so he should have followed some working procedure the first time, I'd imagine... I'll be discussing this with him tomorrow via Skype.