What was the predominant industry in the united kingdom

The financial service sector. The financial service industry, which consists of insurance, fund management, management consultancy, accounting services and many more contributes around 80% of UK's GDP. The industry makes up about 10.7% of the UK economy, contributing ÂŁ176bn in 2015 alone. The industry is also the largest exporter, generating more tax revenues for the government than any other sector, and running a trade surplus of around ÂŁ72bn. The financial services industry is in the UK is especially important; there are an estimated 2.2m financial and professional services employees in the UK today.

4.a depression is the answer