They say the boxes represent living conditions in Gaza, and their protest shows the conditions faced by people trapped by the blockade.
Hendrick Van Der Mescht is to cycle 15,000 miles across 13 countries to raise money and awareness for ex-servicemen who suffer from PTSD.
Take a look at the pictures as London plunged into darkness last night, to pay tribute to those who lost their lives in World War One.
WikLeaks founder Julian Assange announced he will be leaving the Ecuadorian embassy "soon" after two years at the building.
Assange told a press conference, "I am leaving the embassy soon - but perhaps not for the reasons that the Murdoch press and Sky News are saying at the moment".
By Juliet Bremner: UK Editor
There is a huge number of media outside, but a police officer has just been out to relay a message that there will be no further events or movement here at the Ecuadorian embassy today.
I suspect this is a big publicity stunt to try and get the British Government to engage in a discussion about his release.
Julian Assange says: "It is often falsely reported that women in Sweden have accused me of the serious crime of rape. That is false. No woman has done so."
"I am leaving the embassy soon, but perhaps not for the reasons that the ... press are saying at the moment," Julian Assange has told reporters.
WikiLeaks founder Julian Assange has said the position Ecuador has taken on his case "is the correct one".
Assange sought refuge inside Ecuador's London embassy two years ago in a bid to avoid extradition to Sweden for questioning over sexual misconduct allegations.
He has denied the claims made against him.
Julian Assange has hinted at unspecified health "difficulties" - mentioning in particular the lack of outdoor space and sunlight at the Ecuadorean Embassy in London where he has been holed up for two years.
– julian assange
In relation to my health, as you can imagine ... being detained in this country in various ways for four years, and then in this embassy for two years ... It is an environment in which any healthy person would find themselves soon enough with various difficulties.
Julian Assange has stressed he has not been charged with an offence in the UK or in Sweden "at any time".
"The basis under which my asylum was granted here [at the Ecuadorian embassy] is the ongoing US investigation into me and WikiLeaks", he said during a press conference.
Police have erected a fence around the steps of the Ecuadorean embassy in London ahead of an expected news conference by Julian Assange.
A police officer could be heard arguing with a someone who emerged from the embassy about whether the pavement was public or private property.
"Police can deal with it, not you," the officer said. "Let me call the council then," he replied.
WikiLeaks founder Julian Assange will hold a press conference this morning where he is expected to announce he is leaving the Ecuadorian embassy after two years.
The Australian is in need of critical hospital treatment after developing heart and lung problems and could hand himself in to police on his release, sources reportedly told The Sun (£).
He sought refuge inside Ecuador's embassy in London after exhausting all routes of appeal to avoid extradition to Sweden for questioning over sexual misconduct allegations.
Assange denies the claims made against him.