Will do - I'll ask for specific details about what they address..
OK, I received a little bit of information on what some of these updates are, from a Lotus tech - not what they address, but what components they update. He said the IHU is something he has not heard of, and didn't have CPC off the top of his head. He heard of the DIM, and from memory thought is was brakes.
CEM - Central Electronics Module
CPC - Central Powertrain Controller (
@Neil D. @gdotp )
IHU - Integrated Head Unit
DIM - Brakes (maybe)
VCM - Vehicle Control Module
Still investigating what each update addresses, but Lotus tech told me there is no PDF to explain each update - they scan the car to find updates available, send to Lotus to determine if they are required, if yes they apply them. Additionally, I was told that the Lotus update tools will not run off the available high speed WiFi, that they have been using mobile hot spots - hence the updates taking hours due to transmission speeds...

(did not see in practice, so can not confirm)