Ann: Grant Application Notification, page-179

Here is a theory that may point at a T20 dumping:

A day trader (naturally being more on the ball with keeping up to day with the news from all sources by the minuet) would there and then dump their parcel on the 6th (in the afternoon) in case they lost the opportunity to make a few quick bucks. There was not much dumping on that day. A T20 (albeit lazy) holder would take it "a little" cautiously, and would wait just a bit longer (till next open - on 7th) to see if GPP would have prepared a counter plan for this scenario, e.g., more detailed plan A/B (not just "will continue") before they risked losing their shares (and possibly not be able to buy back in case a plan A/B had been worked out and incl in the announcement).