Genuine questions (I am NOT a legal authority):-
I believe that the PFA (not the EFL) have advised the players not to "strike". However, under the Employment RIghts Act 1996 you can eventually withdraw your labour.
ACAS says:- "If you have not been paid on time and in full, you have the right to withdraw your labour. Under UK law, employers are obligated to pay their workers' wages on the agreed pay day. If an employer fails to pay on time, it can be considered a breach of contract and an unlawful deduction of wages. This means that you can take action to recover the unpaid wages, which may include bringing a claim for unlawful deduction at the Employment Tribunal or County Court.
So, the questions are:-
Are the players really striking if they withdraw their labour since the employment contract would appear to have been already broken on numerous occasions by the employer? (which begs the further question are football contracts covered by self-employed status, employed status or somewhere in between?)
Can specialised employment contracts trump UK Law when it comes to employee obligations?