Detecting an open pen is one thing but surely the risk can be further mitigated if it does happen by fitting current detection in the cpc going to the car and interrupting it at a certain threshold. I think this is built in to the Myenergi Zappi. 
Or you could all jump on the ferry to Ireland. Most of the country is PME but no one worries about open pen conditions. The take up of EVs is substantial here and you don’t see too many bodies lying in driveways, at least not during the week when the bars are less busy!

Detecting an open pen is one thing but surely the risk can be further mitigated if it does happen by fitting current detection in the cpc going to the car and interrupting it at a certain threshold. I think this is built in to the Myenergi Zappi. 
Or you could all jump on the ferry to Ireland. Most of the country is PME but no one worries about open pen conditions. The take up of EVs is substantial here and you don’t see too many bodies lying in driveways, at least not during the week when the bars are less busy!