You may book a week in advance however, if you checked the restaurant and found they were offering 50pct discount you would cancel your original booking and book again.
More people make impulsive and last minute plans than book ahead. I just sold a little of my holdings of 350k shares and bought 250k and 100k into my Isa
According to FSA rules If it is an untrue statement about insider knowledge then BigDish are under no obligation to deny it. If it was inside information then BigDish would have to acknowledge the comment.
So basically the silence proves the statement insignificant enough to make to impact on the share price. Insignificant news can be broadcasted by any way and at any time of day other than RNS Therefore this insignificant news can be told anytime on Thursday