Having put up with the clicking/knocking coming from the O/S front for about 6 months (it was actually loud enough that pedestrians were stopping in the street to look!) and changing 2 CV joints, one was actually knackered, I finally bit the bullet and treated the old girl to a new front caliper (49 quid including post off Evilbay).
Its like driving a Rolls Royce compared to before (well, a really old, leaky, rusty Rolls Royce with a diesely engine anyway).
Metal sheet has arrived to start on the inner wings. It'll be that good soon I wont want to get it dirty.