Giving Mittal company on the new list, compiled by the Times newspaper, is another Indian-origin executive Arun Sarin, the world's top mobile firm Vodafone's outgoing CEO, who has made it to 24th in the combined list, even though he does not figure among the top 1,000 richest persons in the UK.
Mittal, with an estimated fortune of 27.7 billion pounds, had also topped this year the Sunday Times Richest List, which has been combined with the Times Power 100 list to make the 'Richest Power List'.
The Power 100 is an annually compiled survey of the top names in business in the UK. The Times newspaper cross-referenced those on the Power 100 list with another annual ranking, The Sunday Times Rich List, to produce the Richest Power List.
The daily said, "Money and power have always been thought of as natural bedfellows: you only stand a chance of holding sway if you have the wealth to back it up."
"To test the truth of this we combined The Times Power 100 with The Sunday Times Rich List - and we discovered the opposite. In the world of British business at least, it seems that you don't have to be rich to be powerful," it noted.
Out of the 26 of the Power 100 who also made it onto the Rich List, only 10 got a place in the top hundred, it added.
"Lakshmi Mittal, who tops the Rich List, also leads our combined list," the Times said. Mittal, CEO and main promoter of the world's largest steelmaker ArcelorMittal, was ranked sixth in the Power 100 list.
However some of richest are least influential, the report said, adding, "the man who manages the economy and the man who would like to - Chancellor Alistair Darling and his shadow George Osborne - are absent" from the Richest Power list, despite being ranked 11th and 51st in the Power 100.
Bank of England Governor Mervyn King, who beat Darling with 7th rank in Power 100, is also absent from the new list. Sarin, who was 38th in Power 100 list, stood at 1,259th place in the Rich List with a wealth of 60 million pounds. "But there is one assumption is particular that the
Richest Power List seems to support: money and influence lie mainly with men. While only 10 women featured the Power 100, not even one is to be found in the combined list," Times said.
In the list of 26 richest and powerful individuals, Mittal is followed by clothing retail tycoon Philip Green, Virgin Group's founder and owner Richard Branson, chemicals major Ineos Chairman and CEO Jim Ratcliffe and hedge fund Atticus' President Nat Rothschild in the top five.
These are followed by Icap CEO Michael Spencer, Carphone Warehouse CEO Charles Dunstone, easyGroup founder Stelios Haji-Ioannou, Designer and inventor James Dyson and Pearl Group CEO Hugh Osmond in the top ten.
Others on the list include Marshall Wace Asset Management Co-founder Ian Wace, Apax Partners Co-founder Ronald Cohen, Terra Firma founder and CEO Guy Hands, Goldman Sachs International Co-CEO Michael Sherwood, BP chairman Peter Sutherland, Permira chairman Damon Buffini and Alchemy Partners Managing Partner Jon Moulton in order of their ranks.
The Richest Power List also has HSBC's Simon Robertson, Channel 4 Chairman Luke Johnson, TV and music producer Simon Cowell, WPP CEO Martin Sorrell, Barclays Capital CEO Bob Diamond, Reckitt Benckiser CEO Bart Becht, Vodafone CEO Arun Sarin, BAA Chairman Nigel Rudd and Lord Hollick, Non-Executive director of Diageo, KKR, Nielsen and Honeywell.