Well, you got me thinking! If all the external data looks good then the finger must point to something at the LAN end of things here.
So, instead of assuming (as I had done) that a laptop's resources wouldn't intefere with a speed test I thought I had better check that.
Did a speed test as normal and got 159Mbps.
Restarted the laptop in Safe Mode..... Ran a speedtest..... 370Mbps!
Note to all who are getting poor speeds - check in Safe Mode!
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