LONDON (Bloomberg) — The fortunes of the richest people in the UK rose at a record pace last year, with the 1,000 wealthiest experiencing a 30 percent increase in their net worth, according to the annual Sunday Times Rich List.

Lakshmi Mittal, the 59-year-old chief executive officer of ArcelorMittal, the world's largest steelmaker, topped the list for the sixth straight year. His fortune doubled to £22.5 billion ($34.6 billion) as the recovering economy bolstered orders from automakers and builders, according to the Rich List, published yesterday. Roman Abramovich, 43, the Russian-born billionaire, remained in second place after adding £400 million to his net worth.

The cumulative wealth of the UK's richest people rose to £333.5 billion ($512.8 billion) during the year. The total fell short of the record £413 billion reached in 2008, according to the rankings compiled each year by Philip Beresford. None of the top 10 lost money during the year, while the number of billionaires on the list rose 10 to 53.

The list has been compiled for the past 22 years and is based on identifiable wealth, including property, art, racehorses and shares in publicly-held companies. It excludes bank account balances.

The 30 percent increase in combined wealth in the last year is "easily the biggest annual rise" in the history of the list, Beresford said in an e-mailed statement.

The year before, the net worth of those on the list had plunged 37 percent, in the depths of the global financial crisis

The highest new entry was Joseph Lau, the 58-year-old chairman and CEO of Hong Kong-based Chinese Estates Holdings Ltd., who took the 12th spot. Lau, with a fortune calculated at £3.8 billion, recently paid £33 million for a house in London's Eaton Square.

The Duke of Westminster, the highest-placed British-born billionaire, remained in third place. His ancestral land holdings in central London are among the most expensive properties in the nation and helped boost his net worth by four percent. It was the smallest gain seen among the wealthiest 10 people in the UK. The Queen, 84, ranked 245 with a fortune of £290 million.

New to the 10-top list were Alisher Usmanov, who made his money in steel and mines, Galen and George Weston, whose wealth from retailing was combined this year, and Indian-born Anil Agarwal, who had an increase of 583 percent in his fortune thanks to the skyrocketing price of his London-based mining group Vedanta Resources Holdings Ltd.

Falling from the top 10 were Hans Rausing and family, whose fortune is in packaging; Sammy and Eyal Ofer, and John Fredriksen in the shipping industry; Joe Lewis in investments; and Kirsten and Jorn Rausing in inheritance.

Mittal holds a 41 percent stake in Luxembourg-based ArcelorMittal, which he formed through the takeover of Arcelor SA by Mittal Steel Co. in 2006. The stock surged 89 percent in 2009 as it boosted output of the metal as the world economy recovered and automakers and builders increased orders.

Abramovich, owner of Chelsea Football Club, accrued his wealth after the fall of the Soviet Union by building up Russia's fifth-largest oil producer. His oil business, OAO Sibneft, was bought by OAO Gazprom in 2005 as then-President Vladimir Putin moved to return the country's oil wealth into state hands.

The billionaire, once Russia's richest man according to Forbes, has since bought into metal producers. Millhouse LLC, which manages his assets, has stakes in Evraz Group SA, Russia's second-largest steelmaker, and Highland Gold Mining Ltd.