So...
Had this little issue for a while but only noticed it usually when braking and cornering slightly... After having the car up to underseal it with Tetra Schutz and having all the wheels and drums off... The problem seems to have gotten worse and is just knacking with every rotation of the wheel

. Not exactly sure whats causing the problem, had the drums off to inspect them all today and everything looked ok? Could it be the locating pin being too long and catching on the shoes or something?
Looks like i'll have the task of getting it up again tomorrow!