I would like to acknowledge and thank all the contributions made by members of this Forum re this issue.
All braces are being replaced on mine next week, at NO cost to me, after some very minor rust was found recently.
In brief, I have an early 5 litre S that is serviced by an independent mechanic who bought the issue to my attention. Armed with his report and information from this Forum, the initial dismissive response from JLR (Aust) was that the rust was caused by 'stone chips and bottoming-out'.
After calling upon the support of our Office of Fair Trading Dept, JLR (Aust) have amended their opinion.