Hi Julia - just you rest and take as long as you need before going back to work - if its anything like where I work you wont get any thanks for going back anytime too soon!
I had originally thought I'd be able to take my time before going back, but think I'll need to get back as soon as possible as we're going through a restructure at the moment and possibly another review in December-time once the October changes have had chance to settle! If I have my op late Oct-mid Nov time then I'm going to be bang on December for time off! Which means, if I have to go back to my substantive post in December, I'll start with sick leave (great!) - also my substantive isnt where I left it - its been moved to a new team in a new location, doing something I've not done before.