The Brexit Paradox

Did I read recently that, had the Brexit referendum been legally binding, the courts would have ruled it void because of the various frauds associated with it? But that, because it was only advisory, no such ruling was possible? I think I did.

This leads to the curious paradox whereby, had the referendum been obligatory it could have been cancelled, but because it was not, politicians feel they have no choice but to carry on with it. Such is British politics at the moment.