If the couple had nothing to do with SLs disappearance then you can still understand the male of the couple wishing to dissociate himself from the notoriety of the case. Akin to AL, and others no longer giving interviews etc.
But for the female of the two, it does beggar belief. According to the AS book, the female turned up on the Weds 'blaming herself' for SLs disapperance as she was orginally due to meet SL that Monday lunchtime herself. Why has none of the countless tv docs mentioned this?
Plus being one of the founder fundraisers of the SL Trust she has never again spoken publically about SL, this despite her going on to become a (minor) uk tv celeb! Has she just point blankly refused to talk about SL? Or has she been told not to?
The female did publically mention Diana Lamplugh's death in one of her blog enteries. You will need to google that as that link is blocked on these pages?!
Maybe there is 'threatened legal action', which IMO is odd as names are already in the public domain, alongside the likes of 'Clive Vole', published in the 1988 book 'The Suzy Lamplugh Story'.
Who are the couple people are referring to? Is it the LL and his wife and not CV and wife?