Camila Batmanghelidjh was permitted to challenge findings made by the Charity Commission about Keeping Kids Company before her death.
The incident happened on the A20, near the junction with Kidbrooke Park Road, Eltham, at around 6.15pm on Thursday.
Andrew Talbot, 54, was found guilty following a trial of supplying a controlled drug of Class A and misconduct in public office.
A judge has criticised the “arrogance” of animal rights activists who caused thousands of pounds worth of damage to a Buckingham Palace fountain by releasing red dye into it.