I stumbled across your website with interest.
I understand you are searching for details surrounding a death at Bentley Colliery some years ago?
I worked in the Doncaster coal field between 1975 and 1991. My colliery was closed as part of the pit closure program at that time. I had a choice then to take redundancy or transfer to Bentley Colliery and I chose the former.
Although I do not have any information relating to the death I do remember, during my years in the early 1980's studying at Doncaster College, Waterdale.
During that time I remember seeing many official reports on many disasters within the mining industry (including the Bentley paddy train and the inrush at Lofthouse Colliery). These reports were kept on the shelves of the Doncaster College library and they could be read by any member.
Although the building has since been pulled down the College has re-sited to the other end of Town. Hopefully they may still have these reports and I'm sure you will find the contents as interesting as I did.
Here is a link to Doncaster College and ask for the Library section. http://www.don.ac.uk/about/contact_us.aspx
Shortly after my Colliery closed - Brodsworth, I did a short video commentary on certain aspects of the closed mine. My intention was to go back later and show the difference some 20+ years later.
Re Peter Croft looking for his checks, see below. I think I managed to get a hold of mine (no pun intended), on the day I left but since my number changed as the pit employment shrunk I never got to get hold of my 1385 check number (I ended up with 71). Peter probably needs to contact someone who worked in the time office but I suspect the checks were just scrapped.