It suddenly strikes us that charging off the motorway on a Sunday has a downside we hadn't thought of before.
The chances for that euphemism known as a bathroom break (we prefer the Anglo Saxon pee stop) are few and far between.
Boys don't have to worry about this. Heck they can even pee as they drive along if there's an empty bottle around.
Girls – even if we possessed the ridiculous anatomy required to achieve this feat – would never stoop so low.
So we're in this supermarket car park charging the i3 and there's a laser game centre over the way blaring music. There'll be a toilet in there, right?
Indeed there was. Also a bouncy castle but no sign of an laser game. No need to cross legs (or eyes) for the next stage of the journey north.