When you return from a sabbatical to your job, think of a very long school holiday. Think of returning to school, but imagine that the school has no playtime, no breaktime, and they don’t play sport for a few hours a week. Nor do you get to leave at 4pm. Returning to your office might be frighteningly the same – people you recognise working on projects you remember, people sitting in the same places, with the same posters on the wall. Be prepared for a shock, if you printed out lots of pictures and stuck them on the office walls eight months ago. They’re probably still there.
The only other thing of note is that you start to feel tired at about 11am, and if you’re not used to sitting in front of a computer and a phone for hours on end, staring out at the overcast grey sky of London might leave you wondering when you’ll be back out with the sun and sea.