Israel’s assault on Gaza has provoked demonstrations in every town and city in Britain. Last weekend saw local protests across the country.
On Friday of last week more than 3,000 people filled the road outside the Israeli embassy.
The call for a new national demonstration went out Israel broke a ceasefire within hours.
Speakers included Lindsey German, convener of the Stop the War Coalition.
She told the rally, "We want you to go away back to your friends, back to your family, back to your workplaces.
"We need to get as many people to the demonstration as possible."
Two hours after official speeches ended several hundred protesters continues to march in west London chanting “we want sanctions”.
In Scotland 3,000 surrounded Glasgow City council chambers. Activists announced a national demonstration in Edinburgh to coincide with the London march set to take place this Saturday.
Ken Loach joined 3,000 demonstrators in Bristol and 300 braved the rain in Dudley and in Stoke.
Around 2,000 joined the Greater Manchester Stop the War protest last Sunday while in Wakefield 500 protested, speakers included the Imam from the local mosque and the ex president of the Yorkshire national Union of Miners.
Shoppers applauded and joined the Haringey Justice for Palestinians march of over 300 in north London.
In Birmingham 300 people protested over the sale of Israeli products outside Sainsburies.
A young boy led the chanting and said ‘Israel stop killing children like me.’
After the children invaded the store and held a die-in the shop was closed.
Activists are going all out to build the demonstration set to take place on Saturday, local Stop the War and Palestine Solidarity Campaign groups, trade unions and mosques are booking coaches.
Stop the War has called for trade unionists to leaflet local workplaces on Wednesday, while Thursday is to be a day for leafleting rail stations, and Friday will be spent leafleting mosques.