The emergence of a document contradicts claims made by the Post Office over bugs in its IT system during criminal prosecutions.
Philip Young is charged with offences including rape and administering a substance with intent to stupefy.
The singer died in hospital on Monday following a short illness, his family said in a statement.
The Met says the men were part of an organised gang who would arrange to meet their targets at home.
A third individual on remand for alleged offences relating to the Palestine Action group has ended a hunger strike after 49 days.