Thinking about this further and taking into account the...

Thinking about this further and taking into account the following definition of a CFD arrangement:
A contract for difference (or CFD) is a contract between two parties, typically described as "buyer" and "seller", stipulating that the seller will pay to the buyer the difference between the current value of an asset and its value at contract time

I am thinking perhaps the original directors interest under which the CFD arrangement was mentioned was most likely the equivalent of either an agreement to purchase the shares on a set future date at market price or an agreement to purchase the shares should they fall to a set value (more likely given the next notice occurred near the low).