So explicitly, for the period 01 July 2106 to 30 June 2017 -
Mr Marshall (company secretary): purchased 19,681,535 shares.
Mr Wishart (COO): purchased 17,906,673 shares.
Management own 1,443,668,638 shares or 47.17%
Top 20 own 59.71%
Now they're stats you don't see every day!
Skin in the game!