The man who provided police protection to Lady Thatcher, Bob Milton, said the biggest risk to the former Prime Minister's funeral is the "lone individual".
He said opportunists could use the day to "mark their hatred" for the former Conservative leader.
Downing Street has released a detailed Order of Service for Baroness Thatcher's funeral on Wednesday.
The full details of Baroness Thatcher's funeral have been released by Downing Street.
Baroness Thatcher's daughter Carol has spoken publicly to thank everyone who sent messages of sympathy and support.