The structure was not above ground just flat cement let into the grass.
It might have been used for tethering weather balloons.
I am now inclined to think it was something my older brother invented about the Zeppilins.
The Bridge over the Railway at Langton Rise was substantial to the strength as the other bridges on this line.
I can remember as we walked up to the bridge the building on the left was part of the Public House that filled a large area at the back. we used to look in a small window no larger than a toilet window and watch the horses in their in their stalls.

Thanks for the help!