I live in Ireland but have visited the UK. As far as I know, codeine products are legal in both countries but pure codeine products have a higher schedule than combination products (codeine/paracetamol, codeine/ibuprofen).
There was a high profile case of a woman who died after Nurofen Plus. She died from a perforated bowel. I personally know a few others who did't die but suffered serious effects to their GI tract, and stomach.
The first thing someone would say is that they should be prescription only. I don't think so. As someone who suffers from migraines, Nurofen plus a few times a month is invaluable. It would be a waste of money to put in on prescription not to mention the greater burden on GP's on both sides.
A pharmacist I listened to on RTE said that even though she was addicted to the codeine, it was the ibuprofen that killed her. There are a few OTC codeine products but they are controlled.