Divided Britain: How UK became among most unequal in developed world

The figures suggest that the around 634,000 Britons are worth as much as the poorest 13 million and the charity urged Theresa May to take action to close the gap between the “haves” and the “have nots”.

Oxfam’s report suggested that the massive inequality in British society contributed to the vote to leave the European Union and called for sweeping reforms to big business.

The report said: “The UK is one of the most unequal developed countries in the world. Three decades of high-level inequality have had a profound impact, leading many people to believe that they have little stake in society and to feel locked out of politics and economic opportunity.

“Whatever your views on Brexit, the referendum brought divisions within our country to a head, with many people expressing distrust and disconnection with political processes and voting for change in the hope that it would improve their economic position.”

The Oxfam report used data from Credit Suisse which showed the richest 10 per cent of the UK population own over half of the country’s total wealth (54 per cent) with the top one per cent owning nearly a quarter (23 per cent), whilst the poorest 20 per cent share just 0.8 per cent of the country’s wealth between them.

The paper welcomed the Prime Minister’s recognition of the need to shake-up corporate culture and suggested a four-point plan action plan for her to adopt.

The measures included delivering on Mrs May’s pledge to give a greater voice to workers through greater representation on company boards.

Under the plans firms would be given incentives to improve the skills of their workforce - particularly in sectors which employ large numbers of women such as retail, childcare and social care - while the welfare system would be redesigned to encourage claimants to undergo training and education in an effort to increase their wages.

The third element of the plan would see pay ratios adopted to curb excess salaries at the top and tackle low wages at the bottom.

Under the proposals, firms should aim that the most highly-paid person at the firm can earn no more than 20 times the salary of the lowest-paid worker.

Finally, Oxfam called for action to tackle corporate tax avoidance and end UK-linked tax havens.

Rachael Orr, head of Oxfam’s UK Programme, said: “Inequality is a massive barrier to tackling poverty and has created an economy that clearly isn’t working for everyone. The UK is one of the richest countries in the world, but it’s a nation divided into the haves and have-nots. Whilst executive pay soars, one in five people live below the poverty line and struggle to pay their bills and put food on the table.”

A separate report by the University of Birmingham underlines the growing divide between Britain’s “haves” and “have-nots”.

While more people have benefited from workplace pensions and rock-bottom mortgage rates as the economy has recovered, at the other end of the spectrum more have been existing without bank accounts, resorting to food banks and being evicted from their homes, the report said.

It said: “The experience of the recovery and financial inclusion remains very unequal.

“Some people are benefiting from economic growth and greater financial inclusion while many others are struggling ever more and being financially excluded.”