That doesn't sound inaccurate. Tabloid != incorrect, you know. Tabloid is merely a pejorative label applied to newspapers which don't attempt to hide their opinions.
They reach (according to Wikipedia. YMMV) > 12 million readers. If after their anti Euro campaign (again, ignoring the facts at all) still 50% of the population are in favor, how does this even remotely make the non-supporters a majority?
Having done the numbers: The track record for facts from that specific newspaper is poor. Even if you like their agenda in this point, please don't implicate that they are NOT largely misleading (to avoid harsher terms).