Just spotted something else in the document in Woodentop's link...I know we're only seeing one bit of a bigger document, but in the section relating to the hook-up lead it says
"The means of connecting the caravan to the pitch socket-outlet should be provided with the caravan. This must have a plug at one end complying with BS EN 60309-2, a flexible cable with a continuous length of 25 m (±2 m)."
Does that mean that those of us who carry a shorter mains lead, to use when we're closer to the bollard, won't be able to use it any more?