Another reason the miners' strike achieved little was the strength of the forces pitted against them. These included, in varying degrees of importance and to various extents: an authoritarian government that had openly declared war on trade unions, that had framed highly politicised legislation in order to do this, and that had been planning for the strike for several years; the media; the police; the legal system; the military (whose deployment Thatch had planned for, under the auspices of a "state of national emergency", and who were present on picket lines, it was alleged, wearing police uniforms). A bit like David Weir's red and white warriors playing Guardiola's Barcelona. Away. The miners never had a chance. How much difference the UDM breakaway made, in the end, is a difficult question to answer.
Personally, I blame cricket. Here's a snippet from Keith Farnsworth's BEFORE AND AFTER BRAMALL LANE:
"Cricket in Sheffield in the mid-18th century was played on a rather modest scale ... . Evidently cock-fighting and bull and bear-baiting were much more popular pastimes; so much so that in 1751 the local authorities, alarmed by the widespread enthusiasm for these cruel activities, engaged a group of professional cricketers in the hope that they might persuade the populace to turn to a much more respectable and healthy sport. It was not recorded whether this venture had the desired effect, but at least within 20 years Sheffield boasted a team strong enough to challenge the might of Nottingham, where a strong cricket tradition already existed. It was in 1771 that the first of a long and eventful series of fixtures with Nottingham began. ... Unfortunately, this series never quite managed to become an annual event: partly because of a lack of funds, but also, as the games engendered considerable friction, disputes arose and feuds developed which prompted suspension of the fixtures until good relations had been restored" (p1).
Farnsworth has some interesting detail on deaths at a fixture between the two cities when a stand collapsed, and plenty of on-field argy-bargy. The dislike that so many in Sheffield feel for Nottingham may go deeper, historically and culturally, than just the Miners' Strike.