Deighton Pierce Glynn solicitors, the legal firm representing Duwayne Brooks have published a document reportedly authorising the use of 'covert audio recording'.
Police chiefs admitted on Friday authorising the secret recording of at least one meeting involving the friend of murdered teenager Stephen Lawrence, his lawyer said after the meeting.
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The operation carried out by Westminster City Council led to the seizure of £8,000 worth of cigarettes.
Armed troops have been stationed around Parliament to free up armed police to patrol the streets in the wake of the Manchester bomb attack.
Chelsea had planned an open top bus tour to show off the Premier League trophy and hope to add the FA Cup in Saturday's final with Arsenal.