Thanks Roachy. Apart from the one taken in Mexborough, the others, the ones taken at Sprotbrough were taken during the "golden hour" which is the hour before or after dark, in this case the hour before dark. It's the best natural lighting there is, soft and diffused with long shadows for the drama, but you have to be out there to get them.
Even better when the scene isn't back-lit. I had to under-expose some of them by around -3 EV to preserve the detail in the sky and then selectively lifted the shadows in post processing afterwards. If i'd got the scene correctly exposed in-camera, the sky would have been blown out (white) with zero detail (pixel information). It gives them a little bit of an HDR look, but that's better than the alternative. People say it's cheating, but in film photography they dodged and burned, i.e. in the dark room they applied more or less developing fluid to specific areas to increase or decrease the exposure. The PC has now become a digital dark room. Less messy too.