it's the end of the OS road for my Nexus4
Someone will come up with a 6.0 ROM if you want to flash it. I miss my Nexus 4 in a way. There's no chance my Z3 will get 6.0 for a while yet.
Thanks for that, I hate to come across like I'm taking the piss, and I'm not, believe me... but I only understood the first sentence
Ha! Basically I meant that if you wanted to, there are ways of updating/changing the software your phone runs yourself - but it's a little bit complicated, requires a bit of technical nous and generally voids your warranty (if you have one).
If you don't want to do that, you'll have to wait for the manufacturer to release the update over-the-air (OTA) which will show as an 'update is ready' message on your device.