Thanks for your help Kezza, much appreciated.
Im not quite sure about this cocodamol, but alot of medications etc can cause problems with urination, mostly problems like urinary retention - where the bladder can become so extended and needs just an in out catheter to release it, or a subpubic catheter wich is more permanent. Its more likely to effect the elderly more, but i myself have had troubles with meds and urinary retention. Hope i have helped out at all. Just remember all medications etc can come with some kind of complications or sideeffects.