As promised a quick additional update on the Lollipop update on the Galaxy Tab S after a few days of using it. Absolutely no issues whatsoever! Battery life seems unaffected, and there are no noticeable issues with any of my apps - all the O2 apps work fine. After a few days of using it I really do like the cleaner look and feel of lollipop vs kitkat 4.4.2 so I have no problems in recommending if you haven't updated yet - do it - you won't be disappointed.
