I am no expert on these matters, but my hon. Friend may well have a point.
I conclude by saying that if the Minister will make a concession on the point I have mentioned, we can leave the rest of the wider issues to the working party.
Nobody has yet mentioned the cost of implementing the principle. I only wish to emphasise that this expenditure, although not perhaps important in a global sense involving the overall National Coal Board's requirements or indeed the Government's public sector borrowing requirement, will be enormously important to individual firms.