By way of a little update on this project which may help others.

With continued bench testing I was beginning to find problems with pCP
getting a Wi-Fi connection during boot. It was getting more and more
unreliable even though the access point is less than 2m away. The logs
showed that it could see the AP but just not connect having issues
renewing its lease. I was beginning to think that I had damaged the
board in some way because I could not figure out why it would work and
then get worse. 

A thought was to modify the board to add the U.FL socket and use an
external antenna which I have done with my main HiFi player as it is
mounted in a Ali chassis. 

If you look at the setup once its all bolted together the PCB Wi-Fi
antenna on the pi is buried with the cable to the LCD on the screen
running nearby together with the DSI cable. Before I committed to
hacking the Pi I had one last thing to try. I placed a layer of Kapton
tape over the screen, then copper tape which was grounded to the Pi
together with another insulation layer of Kapton tape and bingo it works
reliably again.

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