Ann: Ceasing to be a substantial holder from EGS, page-17

I think your right, EGS have been selling since the two big 1mill xt orders at 17. Broker data from say the 20 July to now would give a good indication of how many they have sold (on market only). That was a very poor(detail wise) sub holder report but then I suppose they don't really care given the problems confronting them. The best way to know how many are left is see if you can get a current t40. Seeing they have already sold a chunk it's only a matter of time till someone steps up to take the rest and take advantage of the current weakness. I also would not assume they are selling with just one broker, they would be looking for buyers where ever they could be found.
T40 will tell the tale.