ChuckMountain
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5. 1 Ethernet cable through hall wall to study then into wall socket. This then goes outside to external wall and runs down outside wall to living room. Entering room terminated at a wall socket
Don't quite get that bit. Is there more than one cable running to the study, or is there a second switch in there? If you are somehow using the one cable for your wife's computer and the switch in the living room then you will be limited to 100Mbit if you have used something like a cable splitter (not recommended in your case. What speed does your wife's computer report and what speedtests?
On your switch you should be able to tell whether something is connected at 100 or 1000Mbit
This should be an easy way to check, you should fully power up each device as they will sometimes drop to a lower speed to conserve power in standby.
Cable back to router\study(?) - Should be green
Panasonic OLED 65FZ802B - would expect this to be 100Mbit (yellow)
Apple TV4K player - 1000Mbit (Green)
Manhattan 2TB PVR -? speed
Panasonic 820 4K Blu-ray player -? speed
Marantz SR7012 home cinema receiver - would expect 100Mbit (yellow)
Oppo 103D Blu-ray player -? speed
If you check and report back we can probably fix it.