A few extra substations...
"At any given filling station you may see a dozen cars being fuelled at any one time. Does anybody really believe that the national grid can cope with this? In order for plug ins to be a real world solution we need a massive upgrade of our electrical infrastructure starting with a whole lot more generating capacity, working through the grid to carry all that extra current right down to the massive cables feeding every "filling" station. Is this going to happen? Who is going to fund it?"
Do you really think our national grid can cope with 4 times as much demand to make all the hydrogen you envisage?
What's harder and more expensive to install, a national hydrogen infrastructure or a few extra 11kV grid connections? The latter is pretty easily added wherever you have a new row of shops or houses. The latter will cost millions per station and probably have the NIMBYs out in force.
Paris, for all the people that think hydrogen is the answer.