Just another quick update on the battery front.
At about 4.20pm the battery was on 79% on the way home from work. That was not bad. I turned data connection off after lunch again and it hardly moved. So my conclusion is that the data connection must be taking about 10 times the power to run than it did previously. ( yes, all very scientific I know lol)

20% down over roughly 8 and a half hours. And about 15% of that was in one half hour period.

At least this is the case on my Note, so possibly for some others too. I wonder what can be using so much power on the data connection now though? Just looked again and still at 79% now because I haven't turned data on still. I'll try just using wifi for the rest of the day now and see how that drains.