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ST7066U 20x4 LCD problems(Solved)

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Dan, whether you know it or not, you are a marvel.

The mystery of why the 16x2 works and the 20x4 didn't is solved :D and it is/was a hardware issue.

And the problem was - the encoder's common pin is taken to gnd via the wiring harness for the 16x2 LCD, when it's unplugged to attach the 20x4 - no gnd connection for the encoder common pin
 
Just goes to prove there is no such thing as a stupid question.

If you hadn't asked it, I would be sitting here looking up the number for Ghostbusters about now :)

Thankyou for everybody's help through this thread, hopefully I will get the chance to repay it somewhere.
 
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You shared a photo of your setup here's one of mine:
MyLashUp.jpg
 
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