Thanks all for the informative responses. I believe we've cracked it.
I looked the other day and there is/are signs of rubbing/friction on a panel attached to the K.Flap; thus suggesting that the two do indeed rub up against one another when the T/R is deployed.
My understanding now is that this keeps a gap around the Nacelle so that air may flow freely outwards from the T/R grating when it is being used. If this gap wasn't there then ejected airflow from the deployed T/R may push forcefully against the nook formed by the engine cowl mount, engine cowl and extended K.Flap which may end up doing damage to the K.Flap.
Sound about right?
Found a good video showing the "guiding" properties of this device - clearly it creates a gap to stop unwanted excess friction of a drooping K.Flap - thus allowing free movement of the T/R aft.
https://www.youtube.com/watch?v=GsurWPENGY0