Naman Ramachandran Writer Neil Gaiman, actor Hugh Grant and historian and presenter David Olusoga are among 120 well-known British figures who have signed an open letter decrying the threat to public service broadcasters from streamers and government.The letter, from campaign group the British Broadcasting Challenge, chaired by former BBC creative officer Pat Younge, states that PSBs such as the BBC, ITV, Channel 4 and Channel 5 are “under severe threat” from “unregulated streaming services and