I was involved in a proposal about 25 years ago to put platforms on the flyover line to allow the Bedford service to reverse and run to Denbigh Hall and MK. The idea at the time was to put the platforms on the embankment to the east of the main line with a walkway to the existing platforms
Quite possible. The bridge to the left of the signal looks familiar, I think may be taken in what was Avenue Street looking towards the junction with Tiviot Dale.
Looking at the background I think you are probably right. The cottages are a mirror image of the same design. The hills in the background look like your first suggestion now that you have reversed the slide.
If it is Dingwall it's more likely to be Craig Road, two crossings to the east of Bridgend Avenue https://www.google.co.uk/maps/@57.6000143,-4.4292466,3a,75y,218.82h,72.93t/data=!3m6!1e1!3m4!1sx8jCiRv7CSrnvSSbqMlSKg!2e0!7i13312!8i6656?hl=en
Some domestic coke in big towns came direct from the local gas works by the coal merchant picking it up on his lorry. Our merchant was a way off from the works so he had the occasional 16 ton mineral of it to keep the stack topped up. He had a few places with coke fired boilers. Our school had a delivery direct from the gas works in a tipper lorry. We used to keep a small amount at home to mix with coal to give a slow burning fire when you didn't want it roaring away.
The wagon at Torre may have been for loading at the gas works siding between Torquay and Paignton. The one I saw pictured at Bath Green Park was stabled near to Bath Gas Works. Both may have been for use to an industrial user who had bottom discharge facilities.
Here's a link to one I posted earlier. The Saloon was TDM 45026 and the loco is 25051
http://www.rmweb.co.uk/community/index.php?/topic/57246-black-country-blues-rolling-stock-workbench/page-4&do=findComment&comment=748725
I suspect that the short post behind the bracket nearest the signal box is a stay post, which may account for the staywire in the earlier picture. The same arrangement is visible on both bracket signals in the aerial shot. The signal reading from the sidings is the post to the extreme right, but that looks old even at the date of that photo, so probably wouldn't have survived to your era.