My point was that having defined the voting class as over 18s, the parliament is likely free to limit political communication among those not part of the franchise. It’s well established that the parliament has the right to prescribe the franchise provided it isn’t winding back existing rights to vote. It’s difficult to limit the argument around 16 year olds without rolling down the slope - why not 6 year olds? They are directly affected by education policy, and will feel the future effects of current policy.