There is some evidence that NSAIDs can hinder bone healing because they suppress the bleeding and inflammation that forms the callus, which gradually becomes new bone. So after my break I stopped the Ibuprofen and stuck with Paracetamol, which is pretty good as long as you keep the level up, the best way to do it is to keep a notepad by the bed and make a note every time you take a dose.
Actually in my case it probably made no difference at first because the two bone ends were buried in the surrounding tissue with no chance of meeting up so in the end they rounded off and gave up trying.