Each case deserved a couple of hours, rather than lumping them together. I think she suspected David Bain of being a copycat killer: both sons wanted a fresh start, both had access to a .22 weapon, both used a scapegoat to conceal their crimes, both were family annihilators.
I'd be surprised if at the time (1994) David Bain would have heard of the Jeremy Bamber case.
At the time it happened he would have been 13, after which it would have faded from any news items.
I'd only heard of the JB case back in 2012 when I watched a doco on Sky.
I was in the UK for 2 months May - July 1985.
I can't remember the case making the news in Australia after returning there in late July 1985.