Being honest, I reckon if everyone took this line then there would be very few liveaboards on UK wateways. Most seem to get the boat first and then gravitate towards a good 'leisure' mooring through trial and error, waiting lists etc., eventually quietly settling there. It's unofficial but few of them seem to get any bother. It's a good idea not to have rows of beans, a goat and chickens, though. Anyway, what makes a liveaboard a liveaboard? Living there two thirds of the time? Four fifths? A private address on land seems to resolve most problems for the floating non-voters I know.