Ben@Forest wrote: ...... the NCB being responsible for Aberfan.....
But the Aberfan slagheap was put there by private mine owners long before the mining industry was nationalised,as were the many,many other slagheaps in other mining areas which the cost fell upon the NCB(the country's taxpayers)to make safe after Aberfan,along with the many open mine shafts up and down the land which needed making safe when private mine owners walked away!
And don't forget the diabolical condition miners worked in under private mine ownership,the most dangerous job a man could do,before nationalisation of the coal industry!
EDIT:- BTW I'm also reminded of the Welsh private slate mine slag heaps just left when the mines closed,been to Llanbris lately?