what inside information could the board possibly be in...

what inside information could the board possibly be in possession of at the moment, that would restrict them from buying stock?
same goes for the last 24 months..

and on PM visiting UK. why wasnt this information released publicly? I dont want to know all his coming and goings, but I would like to know when he leaves the country for business purposes, and exactly what the purpose of same is for.
What are the chances he flew business class...