I am sorry to hear your story,in the UK where we have both private and a National Health Service options available to us, we do, I certainly believe get great health care in general (I'm not getting into the politic of waiting time etc). In fact it can take some time to get the Operation I am told, but once you do, you are cared for well.
Case in point, return to work, as other poster have said everybody is different, every job is different and everybodies 'position' is different in the organisatin. Mybe 3 months if your a lumberjack, 1 month if your a desk jockey who can take regular breaks
Purely personally, I was working after 7 days, 2 hours a day, on blackberry laptop etc. I will not 'go' back to work for maybe 6 weeks to the office, basically because in this day and age I don't need to. I will work when recouvered.
Some Companies are more concerned with 'Attendance' rather that how you contribute, I would have a word with your Company and ask about flexible working.
Additionally, does your Companies Insurance for Safety at work, allow you back without medical clearance. I work for a Canadian Company and I will have to see the Company Ocupational Health Department before they will let me in the doors, in case I sue them for workplace injury !!!
Anyway, good luck
p.s. Iv'e had two BHR's ....