Jan if we knew the date an article was published we could get it through our local Library I got old newspapers from them on the Neil Moss Tragedy which was well before the Bamber case. We would need the exact date cost was very minimal.
Our village library only has the Derbyshire Times which goes up to 1959. Local studies libraries may have them in Sheffield or the Sheffield Archives may have them on film. I dare say that Kew will have them all on film.
I found a site earlier with loads of front pages on the Bamber case, but it costs to have a look at just under £8.00. I suppose when you weigh up the costs of traveling/parking etc it might be worth it.
