Great Britain during the interwar years, post World War One, (1919–1939) was a period of peace and relative economic stoppage, not growing or dropping, yet still unbalanced. Taxes had risen greatly during the First World War, amd never returned to their old levels. A rich man would pay 5% of his annual income before WWI, but once it had come to an end they were paying almost a third.
By the late 1920s, economic performance had stabilised, but the overall situation was disappointing, for Britain had fallen behind the United States as the leading industrial power. There also remained a strong economic divide between the north and south of England during this period, with the south of England and the Midlands fairly prosperous by the Thirties, while parts of south Wales and the industrial north of England became known as "distressed areas" due to particularly high rates of unemployment and poverty.
In the last couple of years leading up to World War Two, Great Britain was still in a position of rebuilding. They were still very hurt from the First World War. They didn’t have much of an army, and no one wanted to fight. Neville Chamberlain, the prime minister at the time felt unthreatened by Adolf Hitler and viewed him as a potential future ally. Chamberlain let Hitler do his thing in Czechoslovakia, but drew the line when he attacked Poland. Therefore on September 3rd 1939, when Hitler would not remove his troops from Poland, Great Britain declared war on Germany.
Chen, C. Peter. “United Kingdom in World War II.” WW2DB, ww2db.com/country/united kingdom. Accessed 13 April, 2018