Ok so I think I have my answer (mostly).

I realized I must use this operating mode to access the output directly from an I/O pin:
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Therefore I have used CMCON = %110
Connected RB3 (PWM signal) to RA0
and I can see the inverted signal on RA3


Now I still have an issue, the rising edge of RB3 happens at the same time as the falling edge of RA3 but the rising edge of RA3 happens 4uS after the falling edge of RB3.

Is there something I can do to fix this?

Thanks

Mike