This is a case of eliminating the issue. If the 'granny' unit works OK then it's probably not the car. So it can be either the cable or the BP Pulse unit causing the problem. The easiest way to eliminate the cable is to find another early Leaf owner to try their T2 to T1 cable in a different place, and vice-versa. I have never found BP Pulse to be reliable either so the issue could be there - or perhaps your registration and account has glitched. Try your cable at a different outlet from that Asda one, or better still at someone's home wall box. This just needs a bit of logical testing to track down where the issue lies. Meanwhile, just use the granny cable until you have sorted this out.