Can you recommend a CD player I should buy?
What is your budget? You could use a basic portable CD player with an AUX OUT or even an old DVD or Blu-ray player.
Even something like this could work:
https://www.amazon.com/Player-Region-Output-Included-Supported/dp/B08319XH53/
Can I use the external port on the sonos 5 for a CD player?
Yes, you can connect a CD player to the line-in port on the Sonos Five.
Read more here:
https://support.sonos.com/s/article/4837?language=en_US
Is it possible to use a twin adapter so I can have both CD and Turntable connected to the single Sonos 5 external port?
Yes, an audio switch like this would work:
https://www.amazon.com/Switcher-Passive-Headphone-Selector-Splitter/dp/B08F2VTFBN/
NOTE: Be sure your turntable has a built-in phono preamp.
Hi - thanks everything answered.
Will order sonos 5, turntable, CD Player and audio switch over next few days.
mccmyles