No, no more than its illegal for a detective to use evidence seized in a raid against a thief ring, to arrest drug dealers because there was a photo of them holding big bags of cocaine with “We Love Dealing Drugs” written and autographed on the back. They’d never have a search warrant for the dealers’ house normally, but because it was robbed by someone else and the photo turned up somewhere else for them to find, it’s fair game.
Indeed, the BBC cannot be seen to give in to government pressure.