oooh ooh
I wonder if the people at the shoot were significant. any whiff of what industries they were in? wonder if they have links to oil/fracking/mineral extraction?
just had a quick skim read. I think ironstone=dolerite= very bad for fracking under as there is seapage along the dolerite layers into aquefers. (google karoo if you are really interested/have time/are totally overinfested)
so we could be leading into a "there's shale gas in them thar hills plot" followed by no you can't dig it up because there is ironstone (hence bringing back carol as she will remember this) Lynda will do some sleuthing and realise you can't frack under dolerite and the dastardly plan will be scuppered. sadly
the Dopeys will already have moved and Brine will get Brookfield. JE will be ruined.
You can however, use dolerite in pottery glazes. so no doubt Fallon will take that up too, in between shifts, cake baking, going to antiques shows and upcycling. 
and so on.
oh please let that be the plot. it will let all this ludicrous set up that has gone on be for something rather than just general irritation. still does not explain the invasion of the Troughtons though
and if it isn't the plot SWs can you make it the plot instead of whatever other silly plot you had in mind.
and is it just me or has David's acting re the siblings and Brine been a bit weird? his delivery has gone odd.