David R was a viewer of Ghostwatch.
He was watching the show while Suzy Monroe was filming for it. He wrote an SMS to the show, saying that people shouldn't trust the ghosts. He made a typo in his message, writing gohsts instead of ghosts. (WC: Ghostwatch)
Behind the scenes
Once Mickey was left in an alternate reality in The Age of Steel, a "David R" took over the Whoisdoctorwho.co.uk website.