OK, i've actually found out this is a feature...
If your phone is set yo portrait mode and you want to rotate the screen, you'll notice a small icon appear next to the home key when you turn the phone - hit this and the screen rotates. turn the phone back and the icon reappears - hit it to rotate the screen.
This is incredibly useful for me who gets frustrated when some apps rotate and i don't want them to (yes, i know there are utilities to l;ock individual apps, but i've never found one up to my required standards )
I found this info on the Digital Trends webite.
This helped me figure it out!
Auto-rotate totally dissappeared from my shade. It wasn't renamed Panel or Landscape, there was simply one less item on the shade.
Anyway, I went to settings and searched for "rotate". This took me to Accessability. I scrolled down and found Auto-rotate screen and turned it on. Bingo! Auto-rotate is back on my shade!
1. Access the Quick Menu by dragging down from the top of the screen.
2. Look for PORTRAIT button and toggle it on and off.
3. If there is no PORTRAIT button, swipe left and right to cinduct a further search.
4. If there really is no PORTRAIT button, click on the "three vertical dots" icon in the top right of the Quick Settings menu. It is beside the cog. It will only be available if Quick Menu is fully extended from the top of thr screen - open it right up.
5. Choose BUTTON ORDER
6. Add PORTRAIT icon by dragging it from the bottom into the Quick Settings menu.
7. Repeat step 1 above.
You've got to be kidding me. They hid the icon from top quick access bar without warning to force you to use the icon on the lower menu bar. Problem is, that feature does not work on all apps like my Sky TV app. The only clue was in the three dots that had a notification buble. The terms 'rotate' 'auto rotate' 'portrait' does not yeild any search results, either.