I imagine it would be good for the odd small bimble or commuter job, but you would certainly have issues if you wanted to do any sort of touring, or medium-long stretches. I can't see it being any use for having a day out in Wales for example unless you lived there, or fairly close by. Hell, for most of us, by the time we go to some of our favourite roads we'd probably have to limp home again...
All that being said and done though, perhaps it will encourage a wider adoption of electrical charging outlets across the country. Ultimately there is a need for improved battery tech, so that you can stuff a ridiculous amount of amps down its throat in one go without any reliability / lifetime issues