Shrewsbury 24 justice campaigners alerted MPs to "shocking" new evidence of a vicious conspiracy by the state machine against innocent trade unionists yesterday.

And trade union leaders warned that success in the battle to clear the Shrewsbury pickets is vital if the murky anti-union activities of today's secret police are to be curbed.

Campaign activists led by actor and former imprisoned Shrewsbury picket Ricky Tomlinson went to Downing Street, nerve centre of the Establishment plot against innocent building workers 40 years ago.