Oral explanation to be held on Wednesday 25 March 2015 at 11.00, page-6

It's possible someone knew hence the seemingly irrational selling of past week. Worst case is surely nothing more than a 30 day delay - but enough to maybe allow those in the know to re-enter at a small discount to what they sold at.
As to the CEO not taking up his entitlement as he knew something - that's nonsense. I declined employer share offerings during the dotcom boom as I was heavily dependant on my salary and thus had a stake in the business anyway - nothing wrong with that, it's not unlike portfolio diversification.