A false prospectus

So the Prime Minister will be announcing on Friday the date for the referendum. Or so some pundits are suggesting.

But given there actually is no agreement going to be in place before a referendum that will have been ratified by all the other EU countries, what if even one of them says, "nope, you’re not on".

Will the referendum result then be challenged?  It should be because we will have voted on a false prospectus.