I don't think that anyone has said they would 'refuse' to cross picket lines, merely that they would be extremely reluctant to do so, and for very understandable reasons - it is not the job of the police or military take sides in a civil industrial dispute, and it would be foolish for a government to order them to do so. Unfortunately Labour, despite the 'New' prefix, still display the authoritarian arrogance so typical of socialists. They believe that they now 'own' the country and everything in it - an attitude usually only seen in African dictators.
Article ....
here
On a related note, some interesting reading here, by a self-described Royal Marine squaddie;
http://www.spectator.co.uk/article.p...-11-23&id=2517
Why I quit the army. Gordon Bourne has resigned his commission in despair