This book is best summarised by its description of the United Kingdom's shift from being the 'workshop of the world' and banker/commercial centre to the world's broker.
Author Norfield discusses how Britain lost the power it had post-War due to costs incurred fighting wars, as well as due to a weak economic situation.
The US took advantage, putting the dollar in a dominant position, but certain elements helped the sterling remain influential - being less fragmented than the US banking system, time zone advantages, restrictions on US banking arising from the inter-war slump etc.
This book focuses broadly on the relationship between the major powers in the '70s and' 80s, in particular the UK positioning itself in terms of its relationship with the US politically, economically and militarally along with the desire to avoid more stringent controls on its financial industry, owing to its relationships with non-EU countries. This influenced the UK's decision not to join the euro - it's 'mid-atlantic' policy, as the author calls it.
The growth of other financial markets in the '70s/80s prompted the UK to remove exchange controls and introduce reforms to attract more foreign companies into its financial industry.
This, the author suggests, was not to benefit a cabal of wealthy financiers in London, but to promote the City as an expanding area for British capitalism as a whole and establish the City of London as a main centre of international finance dealing, even if not necessarily related to the performance of UK economy.
This has resulted in the City being heavily dependent on the balance of power among all the major capitalist countries and how that power shifts over time.
Throughout the book, the author takes the viewpoint of a parasitic finance industry dealing in currencies, exchange rates and securities while having no actual role in the productive economy or the buying and selling of commodities. He argues that imperialism is economic rather than only political or military - a strong hold over world economy by capitalist companies backed up by a strong nation state support, something reflected in the position of successive UK governments in recent years.
States support their own large corporations in the world market through protecting IP and patents, or having politicians front trade delegations to get into foreign markets.
The book is highly informative on the banking system, describing how a very small portion of banks' assets actually goes into productive economic activity, and mostly reflects loans to each other, derivatives etc.
The author argues that profitability levels, especially in the US, are not taking account of any other factors such as dropping interest rates, the exploitation of cheap labour and relationships with countries with cheap labour, and the persistence of central banks buying debt from governments and privately as an ongoing stop gap to a system which is plainly not working.
The book also outlines the US' ability to use the power of the dollar and threat of being cut off from the US banking system for political ends (such as Iran sanctions) and economic ends, siphoning off value from elsewhere, while also largely being less subject to exchange rate risks than other countries.
Nevertheless, the author seeks to emphasise the UK's favourable conditions that are difficult to replicate elsewhere: the dominant language for international business, time zone between Asia and Americas, skilled workforce, commercial and employment legislation favourable to capital, regulation that is strongly defensive of capitalist property rights and friendly towards finance.
But he warns of the problems in the industry in that its main source of investment return - direct foreign investment - is now in a deficit since 2012, and other forms of financial investment such as portfolio investment and bank loans etc do not offer as high a rate of return.
Ultimately, the success of the City lies in the UK's status as a welcoming haven for foreign financial corporations. The book focuses in great detail how UK governments' protection of the industry gives the value of personal and political security for foreign investment in commercial and residential property, football teams, newspapers etc (eg. UK seeking to exempt City from any EU or US sanctions against Russia in wake of Crimea invasion). There is also the factor of the UK's disproportionate use of offshore centres used to garner funds and carry out transactions.
The finance industry, above all, is used to combat the UK's trade deficit, through the pumping of money into a sector with little actual value for the common person, facilitated through a capitalist system which many support and see as immovable despite stagnating wages, underemployment/unemployment and falling standards of living.
Ultimately this is a compelling and accessible book setting out the UK's influence on the global economy through its powerful financial industry, told in a relatively unbiased fashion by someone with a deep knowledge of the industry.