When John Worboys was arrested for raping a passenger in his black cab his name was printed in the papers and dozens of other victims came forward. Without them a conviction might never have been secured, and women who had been drugged by Worboys and awoken confused and worried might never have found out the truth about what had happened to them. The full Lib-Con (Con-Dem, etc) coalition document has in it a promise to provide anonymity for defendants in rape cases.
The evidence suggests that false rape claims represent around 2-8% of cases (much lower than the false claim level for crimes relating to car insurance claims). And the notion that guys who are not convicted of rape are stigmatised is simply not true (consider the dozens of acquitted footballers still pursuing grossly overpaid professional careers) and when they are it's usually because the evidence against them was so overwhelming (like the "I might have raped her in my sleep" guy).
The law giving rape victims anonymity is there to encourage women to come forward despite the stigma felt by rape victims in many cases. This change will cut the rape conviction rate to even lower than it's current appalling level and leave women at even greater risk.