This has been really informative to me.

You put that NHS Englad data (from which you have chosen to opt-out) "is an extremely useful data set to analyse the interactions of drugs (especially those with no immediately obvious links) is certain."

This has led me to look at the NHS England data (something I should have done a long time ago), but I can't find any aspect of it that will enable such analysis. Perhaps I'm looking in the wrong places. Where did you get this information, DMcG? I've looked over the NHS England lists of data and it looks perfect for resourcing but extremely light on drug analysis.