What prevented and what helped the development of the British economy in the 20th century?

The crisis in 1929-1933 had negative consequences. To get out of it, they used state regulation of the country’s economy, tried to develop monopolies. This helped to get out of it. Before World War II, life at the expense of the colonies had negative consequences, when no one wanted to invest in the country’s economy. The Second World War itself weakened the British economy, and state regulation of the economy extended the stagnation until the late 1970s. Thatcher’s arrival made it possible to change the situation: a stake was placed on private property, the state stopped interfering in the economy. She started to grow.