further to what richard states, there was a plan to return a possible predator of cormorants to southern england, in the form of the white tailed eagle.
White-tailed Eagle is not a predator of Cormorants to any significant degree.
I frequently see upward of five White-tailed Eagles a day (and in prime areas, occasionally flocks of 40 White-tailed Eagles) and have never personally encountered a single case of attempted Cormorant predation, even in areas where Cormorants are abundant.
As already mentioned of this thread, the population of Cormorants is rising rapdily in the Baltics, just as is the White-tailed Eagle population.