Maybe you guys in Derbyshire may have to challenge it!
This mine has been closed for years, and mine explorers have been in and out, presumably without hinderence for nearly as long, making it a preemptive right.
As for reworking, cannot see it myself, since it was close to the water table, and I would assume that, this was a major reason for the closure of both these mines.
Maybe some one is after the scrap, and does not want any interference, from us.