Yes - there certainly are restrictions on all company directors...

Yes - there certainly are restrictions on all company directors with regards to this subject, however the thrust of all of this is the plausible assumption that he has had the confidence to invest again based on his directorship 'inner knowledge' of whether or not HXG will or will not succeed.

I for one don't give a rats if the news arrives in a weeks time, his buying tells me that he is confident that the news will be coming some time not too far away and it will be good news.
What will be interesting will be the response of the market to very good news given that HXG has a very small share register and is certainly the lowest of any company that I have invested in over the years. GLT to us all anyway.