A security guard accused of a plot to kidnap, rape and murder Holly Willoughby went to “great lengths” to suggest to others his plans were not mere fantasy, a court has heard.

Jurors at Chelmsford Crown Court heard on Monday that Gavin Plumb’s sexual motive was clear in his “appalling messages” to people online.

Prosecuting, Alison Morgan KC said Plumb, 37, who went by the username Big Bear online, swore “it’s really happening” when an undercover police officer sent an image of a…