I’m looking into this as well as I’m unable to charge at residence. Done a bit of research but not a great deal I’m afraid.
I may be wrong but what I understand about BP Pulse subscription is that Motability will pay for the yearly sub (£7 or £8 a month I think) but we’ll be on the hook for the costs. That sub will allow us to charge from BP pulse chargers at varying prices. I haven’t looked into how costs compare to fueling from the ICE pumps but it’s not a massive difference apparently. Plus it takes longer and requires more planning, etc.
I’ve only just started looking into this as an option and haven’t gotten too far so I apologise for not being able to be more helpful answering your question.