The share price drop was due to the rights issue announcement.
This will probably be approved by shareholders in September.
Since we do not yet know the share-pricing for this, there is uncertainty causing the sell-off.
If they go for fair-value, say £2.50, the share price will likely rise to that level.
Qatar may have a say on the issue price since they are having 2 on the board, and may not wish to suffer too much dilution.