Thanks Alan. I think you're right. I've had a good trawl over the years! Kurri is a few doors down from me and there have never been pics on those posts either.
I have an unusual house, no windows were originally built at the back of the property, supposedly so the Pit Manager who lived here didn't need to see the pit from his home. Our house survey also mentioned a shaft in our back garden. Lots of history but only speculation I think.
Never mind!