Wow, what a response. Many thanks for all your messages. Many have pointed out that Sony haven't actually said they will change anything, which is pretty awful. They recommended people visit an online security website, which says that you should use two-factor authentication. Oh, Sony.
But the worrying thing is that they are still parroting the line that all transactions and security on a PSN account is the responsibility of the user. This is at best disingenuous and at worst dishonest. What's more, it fails to deal with the basic issues of Sony refusing to issue refunds even when they have stopped content working on the account and console.
I am about to get on a plane for the next 17 hours, but will link to the programme when I can and publish some more thoughts. Thanks again, everyone - it's progress but we're not quite there yet!