Today I returned my Z Play to CEX and luckily they had a white Z Play in the shop window to replace it with. Though I'm not keen on white usually, it is growing on me, it reminds me of the white front of the second gen X that I had a while back. The back doesn't matter since I always keep my phones in a case.
It is the dual SIM version, and in better condition than my old one. No massive scratches on the glass back on this one, and unusually has the original unused earbuds in a bag in the box. Not that I would use those, I much prefer either my AKAI Bluetooth/wired ones or my LG buds. It didn't have the original charger but they helpfully swapped it with the original one from the one I returned.
Once I got home, I restored all my apps and settings from Google, (apart from Google Camera since the latest version is Oreo only, so I had to find an older version on APK Mirrror) and restored my Nova Launcher settings from a backup off my SD card, along with the Google Now Companion. I have tried lots of launchers but always end up back on Nova. I also paired and setup my Pebble and Bluetooth headphones. Oh and I also had to download and install 3 security updates to get it up to the December Security Patch level. So far it has been trouble free, hopefully I shall keep this phone for awhile, for as long as it gives me no problems.
Update 22/006/2018 - I've just got the official Oreo update on my Z Play