@Flohack correct. Manually adjusted date & time and issue (invalid site certificates) fixed. Battery performance with no SIM, wifi off, screen off (ie phone not used) charge level went from 100% to 66%.

@Flohack after some fiddling I was able to install following your updated instructions. No access to Openstore, Morph complained of invalid site certificates (ususable), weather app picked up my city no problem, bluetooth did find my speakers. Checking battery usage.

@Flohack there are a couple of gotchas:

the instructions should read: halium-install-standalone.sh -p ut u.... not halium-install

and

Can't do this on Ubuntu 16.04 as the package simg2img is not available until 18.04 - bummer

I'll have to upgrade away from Unity

@UBportsNews link is 404

[xenial] Nexus 5 (r387) bluetooth shows connection to Bose Sound Link II speaker. Speaker does not acknowledge connection, which it does when connected to from Android device. Does Bluetooth work with audio devices (headphones/speakers)? Is this a bug which should be raised in 16.04 Backlog or 16.04 OTA-4/5? Thanks