mattlaing: Ok - before I took this in I tried a couple of things and it now appears that the Battery life is back to where it was before the weekend (lasting overnight).
1) Another thing I did on Friday was implement the Find my iPhone feature - utilising PUSH services. There is discussion on the net that the PUSH technology - if utilised - is a large Battery usage service. Even Apple claims that it currently uses approx 20% of the battery life. That's huge. And some reports on the net are that it's a lot lot more - fairly consistant with my experiences of not lasting even overnight. It would appear there is a bug that create a battery drain in the 3.0 OS software.
2) On that note, 3.1 version of the software is meant to have a few fixes which improve the life of the battery charge.
I upgraded my OS software from 3.0 to 3.1 and I turned off the PUSH service. This initially worked - just doing the upgrade (and restoring from back up) but the 3.1 software has a bug where the SMS app doesn't load if you have a lot of texts. So I had to do a complete restore in order to be able to use the texting again.
Either way - I am no longer being drained of battery life overnight. When the battery life sucked, I was getting 1 cycle after 12 hours of standby.
Since the upgrade I am now getting up to 15 hours and my usage is only at 77%.
GZMCC. Nokia Lumia 1020,Lenovo Yoga C640. 8 gb Ram and 256Gb SSD, Cam Am Spyder F3 LTD. GoPro 5 Black, Huawei P30 Pro,Huawei GT Smartwatch