I read in the paper recently about riding these electronic bikes and the petrol driven ones ,and the police saying they were illegal unless properly insured and having the correct documentation for a public road ,now for insurance purposes when you fit a fixed mover to the caravan and cross your boundary into the public highway ,what is it classed as, as it has its own means of propulsion ,this is just some thing i have going over in my head ,or is there one law for bikes and another for caravans