Just one initial thought on the Crimewatch filming location. I'm not saying it isn't the exact same spot. It just very well might be. But on the other hand, I think it could possibly be the nearest best location.
Meaning for practical reasons really. You notice the Crimewatch snow scene has a nice tree lined backdrop. You can't see anything in the distance. I'm just wondering how many days, and how much money it would cost them to make a snow scene look realistic way into the quarry, and as far as the eye can see??
Perhaps if I were the film crew, I'd go for the easiest option and use a backdrop to save all that work and expense. It all depends on how crucial the Police thought the exact location was to the appeal. My thoughts are it's not very much looking at the shots above. That small snowy grass verge area when filmed, would give you absolutely no idea where it was situated on the lane. IMO that could have been filmed in any lane in the country and you wouldn't be any wiser. Until we have firm evidence of the exact spot, then I'm not going to take this for granted on the strength of this film shoot.
Just a thought to ponder
True, if the film crew had a say, they would choose the easiest location along a stretch of road to film a scene ... but ... this was not the film crew's call. This is a crime scene re-enactment and accuracy is crucial ... in my opinion. The re-enactment already presents the possibility that someone will see the woman from the re-enactment and remember seeing her three days after the murder ... perhaps thinking they saw Joanna three days after the 17th. I hope that police would be accurate with the scene of the crime in the re-enactment. The only other electrical post is between the quarry entrance and the intersection, and coincidentally that also is characterized by a grove of tall trees followed by smaller trees. What is different is the stone wall on the other side of the road. It's difficult to tell for sure, but based on signage and re-enactment photos, it is looking like Joanna was found just a little to the North of the quarry entrance.