John McDonnell, the shadow chancellor, has promised that Labour would bring an end to nuclear power and nuclear weapons in the first 100 days of a Labour government.

In footage uncovered by The Telegraph, Mr McDonnell said that he wanted to build on the early success of Gordon Brown, who mapped his first days in power shortly after becoming prime minister.

The shadow chancellor also said that Labour would introduce a wealth tax and a land tax, renationalise the railways and pull out of Afghanistan.