Earlier today the 37-year-old was quizzed about his previous convictions, including his attempt to kidnap two women from separate trains in August 2006.
Ms Wass asked her client what was 'going through your mind' when he handed the first air hostess a note threatening to shoot her.
Giving evidence today, Plumb said he would sometimes think about his 'celebrity crush' Holly Willoughby 'four, five, six times' a day.
He said online chats about his alleged plot to kidnap her were 'massively regrettable' but claimed it was just 'dark' fantasy.
Plumb said he got a 'rush of excitement' about keeping Ms Willoughby in a 'dungeon', but again insisted 'I knew it was online chat'.
In November 2008, Plumb was working at a Woolworths in Harlow when he ordered two 16-year-old female colleagues who were busy restocking to 'get to the back of the stockroom'. Threatening them with a box cutter, he told them to turn around and put their hands behind their backs.
The security guard served 16 months in prison, and said that after being released in 2010 he spent '99.9%' of his time online.
The defendant also said he would communicate with others on 'fantasy' chatrooms between 2010 and 2013.
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I assume "think about" means jerk off.
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