KE7GKP:
Thanks again for the quick replies.
I am powering the Uno from the USB port.
Dumped the divider and the full scale readings work just fine.
Using the Serial Monitor
5v gave me 1023
3.3v gave 660
0v gave me 0
With the voltage divider:
5v the ADC reading is 510
3.3 gave me 330
0v gave me 0
Apparently its an LCD code problem as the maths work out correctly on the serial monitor.
I'll do some more reading and see what I can come up with, as I must not be sending the right info to the display.
Thanks again for your help
Cory