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As the link road now goes over the former rail line,would this mean that the new station would have to be just before the link road.

Could the line be extended to its original location,if after coming out of the tunnel,the rail line could bear left and run along the side Midland way.

Having said the above, would the curvature be too great coming out of the tunnel and bearing left.

Over network rails dead body would they ever allow a level crossing,or a tunnel(for Midland way) under the rail line.

Any new station for Thornbury would probably be located to the east of Midland Way, near the Grovesend Road roundabout. This is discussed here (https://fosbr.org.uk/timelines/thornbury-line/).

Also worth noting that there are three other level crossings on the line for which solutions would need to be found.

I find myself wondering as to whether we might be excessively cautious in these parts - noting places like Chur, Wernigerode and Wexford - and perhaps even Sheffield.

Indeed. At Portishead, to avoid a level crossing, the station has been relocated a few hundred metres further from the centre of town to avoid the danger of trains crossing a road at (maybe) 8km/h. But as a result a lot of the people accessing the station will have to cross a road with traffic moving at (presumably) 30km/h. Which is safer?

Non-holistic thinking.

I guess the difference is the stopping distance.  Also people generally understand that cars can stop fairly quickly, they do not understand that trains cannot. 

The ORR and the courts, interpreting the safety legislation, require railways to exclude sources of danger, to people of all kinds, wherever they can. Even if that means piling them up them* outside on the street.

(*The sources of danger, of course.)

 Road / Rail level crossing are notorious for risk takers both pedestrians and road vehicles, policy is to remove the risk where ever posible