Brian, nice article, shame that his chronology is wrong in places. I have only skimmed the article but the problem is that once published it can take on a life of its own. He talks of the Mk 1 and Mk 1a being phased out in 1964. Certainly the phase out may have started then, if not earlier, but there were 3 Mk 1a sqns at Waddo in 1967. I think, IIRC, that the phase out was Jul 67 but I would need to check my log book.